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词汇 tri-
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tri-
pref.（前缀）
  1. Three:
    前缀，表三：
    trilobate.
    具有三裂片的
    1. Occurring at intervals of three:
      前缀，表每隔三个发生的：
      trimonthly.
      每三个月的
    2. Occurring three times during:
      前缀，表在…期间发生三次的：
      triweekly.
      一星期三次的

语源
  1. Middle English
    中古英语
  2. from Latin
    源自 拉丁语
  3. Greek * see trei-
    希腊语 *参见 trei-
tri-

prefix

three or thrice
⇒ triaxial
⇒ trigon
⇒ trisect
occurring every three
⇒ trimonthly

Origin

from Latin trēs, Greek treis

tri-

Word Origin
1
a combining form meaning “three,” used in the formation of compound words:
triacid; triatomic.
Origin
Middle English < Latin, combining form representing Latin trēs, tria, Greek treîs, tría three

Related Words

  • trisyllable
  • cyclotrimethylenetrinitramine
  • trefoil
  • trellis
  • trémie
  • tribology
tri-a word element meaning 'three', as in triacid.
[Latin, combining form of trēs, tria three; or from Greek, combining form of treis, tria three and tris thrice]
tri-
combining form
 ETYMOLOGY  Latin (from tri-, tres) & Greek, from tri-, treis — more at three
1. three : having three elements or parts
    trigraph
2. into three
    trisect
3.
  a. thrice
      triweekly
  b. every third
      trimonthly
tri-
/traɪ/  
combining form
three; having three
表示“三”; “三重”：

triathlon.

■  Chemistry (in names of compounds) containing three atoms or groups of a specified kind
【化】表示“（化合物名称）三原子的”; “三基的”：

trichloroethane.

词源
from Latin and Greek, from Latin tres, Greek treis 'three'.
tri-, prefix(traɪ, occas. trɪ)a. L. tri- and Gr. τρι-, combining form of trēs, τρεῖς three, τρίς thrice.The i, etymologically short in Greek and Latin, was in Latin sometimes lengthened, esp. in numerals (trīcēnī, trīgintā, etc.). In Eng. it is now usually long and diphthongal |aɪ|, except in derivatives before two consonants, as triple, triptych, also in trilogy, trimeter. In scientific books tri- is often represented by the numeral, as 3-bracteate, 3-carbon.I. Forming adjs. (and derived ns. and advbs.) with the senses:1. Having, characterized by, or consisting of (rarely, belonging or relating to) three (of the things denoted by the second element). a. In comb. with adjs. derived from ns. (usually L. or Gr.), or less commonly with the n. without adjectival termination. triacˈnodal Geom., having three acnodes or conjugate points (see conjugate a. 6 a). ˈtriact, triˈactinal, triˈactine Zool. [Gr. ἀκτίς, ἀκτῑν- ray], having three rays: said of a sponge-spicule. trialate |traɪˈeɪlət|, Nat. Hist. [L. āla wing], three-winged (Cent. Dict. 1891). triaˈllelic Genetics, having three different alleles of a gene. triˈannulate Zool. [L. annulus ring], having or consisting of three rings. triˈanthous Bot. [Gr. ἄνθος flower], having three flowers. triˈarctic (see quot.). triˈarcuated [L. arcu-s bow, arch], three-arched. triˈareal, comprising or divided into three areas. triˈaxon, -ˈonian, -onid [Gr. ἄξων axis], of sponge-spicules: having three axes; = triaxial. triˈbasilar Anat., designating a bone formed by union of three bones at the base of the skull. triˈblastic Zool. [Gr. βλαστός germ], having three layers (epiblast, mesoblast, hypoblast) in the blastoderm of the embryo. triˈbracteate Bot., having three bracts; so triˈbracteolate, having three bracteoles or minute bracts. triˈcarinate, -ated Nat. Hist. [L. carīna keel], having three keels or ridges. tricarˈpellary, triˈcarpellate Bot., consisting of or having three carpels. triˈcarpellite [ad. mod.L. Tricarpellītēs], a fossil tricarpellary nut-like fruit, found in the London Clay. triˈcarpous Bot. [Gr. καρπός fruit], ‘bearing three fruits or three carpels’ (Syd. Soc. Lex. 1899). triˈcaudal, triˈcaudate [L. cauda tail], having three tails or tail-like processes, as the retrahens auris or tricaudālis muscle, or the hind margin of the posterior wings in some Lepidoptera. triˈcellular, having or consisting of three cells. triˈcentral, having three centres; so † tricenˈtreity, the fact or attribute of having three centres. triceˈphalic, triˈcephalous [Gr. τρικέϕαλος, f. κεϕαλή head], having three heads, three-headed. tricoˈlumnar, having three columns; arranged in or occupying three columns of print. tricontiˈnental, embracing three continents. tricornigerous |traɪkɔːˈnɪdʒərəs| [late L. tricorniger, f. cornu horn: see -gerous], triˈcornute, triˈcornuted, three-horned; having three horn-like processes. tricoryphean |-kɒrɪˈfiːən| [Gr. κορυϕή peak], having three peaks. triˈcostate [costate], three-ribbed. tricotyˈledonous Bot., having three cotyledons. tricruˈnodal Geom., having three crunodes. triˈcrural [L. crūs, crūr- leg], three-legged; consisting of three branches radiating from a common centre. tridiˈametral, having three diameters. triˈdigitate, (a) Zool. having three digits (fingers or toes); (b) Bot. digitate with three leaflets, ternate; so triˈdigital, triˈdigitated. tridynamous |traɪˈdɪnəməs| Bot. [after didynamous, tetradynamous], having six stamens of which three are longer than the others. tri-eleˈmentary, composed of three elements. triˈfasciated Zool. [L. fascia band], having or marked with three bands. triˈfaucian [L. trifaux (Virgil æn. vi. 417), f. faucēs throat], having three throats. trifilar |traɪˈfaɪlə(r)| [L. fīlum thread], consisting of three threads. † triˈfistulary [L. fistula pipe], having three pipes or tubes. triflagellate |traɪˈflædʒələt| Biol., having three flagella, as an infusorian. triˈfloral, triˈflorous Bot. [L. flōs, flōr- flower], bearing three flowers (on one stem); three-flowered. triˈfoveolate, -ated Entom., having three foveolæ or shallow pits. triˈfunctional Chem., having three functional groups in the molecule; hence triˈfunctionally adv. triˈgastric Anat. [after digastric], having three bellies, as a muscle. trigeˈneric Gram. [generic], of three genders. triˈglandular Bot. [mod.L. glandula (glandule), dim. of glans acorn], ‘having three nuts or nutlets in one involucre’ (Cent. Dict. 1891). triˈguttulate Nat. Hist. [guttulate], having three spots like small drops. trihemeral |traɪˈhɛmərəl| [Gr. τριήµερος, f. ἡµέρα day], lasting three days. trihilate |traɪˈhaɪleɪt| Bot. [hilum]: see quot. trihypoˈstatic, existing in three ‘hypostases’ or ‘persons’: see hypostasis 5 (b). ˈtrijugate, ˈtrijugous Bot. [L. jugum yoke; cf. trijugus triple], having three pairs of leaflets: said of a pinnate leaf. triˈlabiate Nat. Hist. [L. labi-um lip], three-lipped. trilaˈmellar, triˈlamellated, triˈlaminar, triˈlaminate Nat. Hist. and Cytology [lamella, lamina], having or consisting of three layers. triˈlophodont a. Zool. [Gr. λόϕος ridge + ὀδούς, ὀδοντ- tooth], having molar teeth with three transverse ridges, as the genus Trilophodon of mastodons. trilophous |ˈtrɪləʊfəs| [Gr. λόϕος crest], having three rays forked, as a sponge-spicule. triˈluminar, triˈluminous [L. lūmen light], ‘having three lights’ (Bailey, 1727). triˈmastigate Biol. [Gr. µάστιξ, -ῑγ- whip] = triflagellate. triˈmembral, ‘having, or consisting of, three members’ (Webster, 1864). triˈmuscular, furnished with three muscles. trinoctial |traɪˈnɒkʃəl| [L. nox, noct- night], belonging to or lasting three nights. triˈnucleate Biol., having three nuclei. triˈnucleotide Biochem., an oligonucleotide in which the number of nucleotides is three. triˈocular [L. oculus eye], having three eyes. trioˈperculate Nat. Hist., having three opercula (see operculum). triorˈthogonal Geom. [orthogonal], pertaining to or consisting of three systems of lines or surfaces, each intersecting the other two at right angles. triˈovulate Bot., having three ovules. triˈpaleolate Bot.: see quot. triˈpapillated Zool., having three papillæ. tripaˈrental a. Microbiology, involving or resulting from the infection of a bacterium by three different bacteriophages at the same time. triˈpaschal [paschal], including three passovers. triphasic |traɪˈfeɪzɪk|, having or exhibiting three phases. triphyˈletic [Gr. ϕυλετικ-ός, f. ϕυλέτης tribesman, ϕυλή tribe]: see quot. triˈpolar, having or characterized by three poles. triprosˈthomerous Comp. Anat. [f. prosthomere, f. Gr. πρόσθεν forwards + µέρος part], consisting of three prosthomeres, i.e. somites which, with their parapodia, have passed forwards from the thorax. triprostyle |traɪˈprɒstaɪl| [prostyle], of an ancient temple: having a portico with three pillars in front (also said of the portico). triˈpunctal [med.L. tripunctālis (Wyclif), L. punct-um point: cf. punctal], occupying three points in space. triˈpunctate [L. punct-um point], marked with three points or dots. triˈpupillate Entom. [cf. pupillate], having three ‘pupils’ or included spots, as an ocellated spot on an insect's wing. tripyˈramidal Cryst., characterized by three types of pyramid: applied to a class of the hexagonal system. triquaˈdrantal Geom., formed by three quadrants, as a spherical triangle. trirecˈtangular, having three right angles, as a spherical triangle (Worcester, 1860). trirhomboˈhedral Cryst., characterized by three types of rhombohedron: applied to a class of the hexagonal system. trisceptral |traɪˈsɛptrəl|, having, or pertaining to, three sceptres. triˈsensory, pertaining to or affecting three of the senses. triˈsepalous Bot., having or consisting of three sepals. triˈseptate, having three septa or partitions. triˈserial (whence triˈserially adv.), triˈseriate, arranged in three series or rows. triˈsetose Entom., bearing three setæ or bristles (Cent. Dict. 1891). triˈsinuate, triˈsinuated, having three sinuses or inward curves, as the margin of an insect's wing. triˈspermous Bot. [Gr. σπέρµα seed], containing three seeds. triˈspinose, triˈspinous Nat. Hist., having three spines. trisplanchnic |traɪˈsplæŋknɪk| Anat. [Gr. σπλάγχνα viscera], applied to the sympathetic nerve, as having connexions with the viscera of the three great cavities (cranial, thoracic, abdominal) of the body. trisporic |traɪˈspɒrɪk|, trisporous |traɪˈspɔərəs| Bot., having or consisting of three spores. tristachyous |traɪˈstækɪəs| Bot. [Gr. στάχυς ear of corn, spike], having three spikes. tristigˈmatic, triˈstigmatose Bot., having three stigmas. triˈstylous Bot., having three styles. triˈverbal [L. verb-um word], consisting of three words. triˈverbial [f. L. tria verba three words]: see quot. triˈvertebral Anat., consisting of three vertebræ united. triˈvirgate Zool. [L. virga twig, rod, stripe], marked with three streaks or stripes. trivoˈluminous, consisting of three volumes; composing a work in three volumes. triˈzomal Geom. [Gr. ζῶµα girdle], applied to a curve having an equation of the form √ U + √ V + √ W = 0: cf. polyzome, and tetrazomal s.v. tetra-. b. With Eng. ns. (without adj. ending); chiefly nonce-wds. instead of the usual formations in three-: as tri-church, tri-county, tri-letter, tri-party, tri-phase, tri-state. c. Occas. with n. + -ed2 (instead of the usual three-..ed): as tri-bladed, tri-breakered, tri-cornered, tri-faced, tri-legged, tri-membered, tri-pointed, tri-sceptred, tri-shaped, tri-zoned.1873Salmon Higher Plane Curves 245 The quartic is a *triacnodal curve composed of a trigonoid figure within the triangle and of the three vertices as acnodes.1886Lendenfeld in Proc. Zool. Soc. 560 The calcareous triaxon spicules have only three rays—*triact. [1886Proc. Zool. Soc. 21 Dec. 563 Triactina, with three rays.]1891Cent. Dict., *Triactinal.1887Sollas in Encycl. Brit. XXII. 416 (Fig. 12) c, triod (triaxon *triactine).1944S. S. Atwood in Proc. Nat. Acad. Sci. XXX. 70 Because suitable terms to describe multiple alleles in autotetraploids would facilitate the discussion, the following new terminology is suggested and will be used in this paper:..*Triallelic.1975Nature 24 July 310/2 Triallelic plants..cannot be obtained by any normal form of inheritance and their appearance is strong evidence for the occurrence of an unusual genetic transfer process.1901Proc. Zool. Soc. 5 Mar. 197 The sixth [segment] is *triannulate.1891Cent. Dict., *Trianthous.1883A. R. Wallace in Nature 22 Mar. 482/2 Heilprin..seeks to show that the Neoarctic and Palæarctic should form one region, for which he proposes..‘*Triarctic Region’, or the region of the three northern continents.1822J. Parkinson Outl. Oryctol. 264 A series of *triarcuated, imbricating, transverse slips.1897Allbutt's Syst. Med. II. 142 Gresswell, under the names ‘*triareal’ and ‘pentareal’, has described certain peculiarities of the tongue.1886*Triaxon [see triact].1887Amer. Nat. Oct. 938 A *triaxonian star with five or six rays.1911Encycl. Brit. XXV. 729/1 Sponges with a skeleton composed of siliceous spicules,..either *triaxonid and hexactinellid in form, or derivable from the triaxonid..type.1878Bartley tr. Topinard's Anthrop. v. 173 Cretinism, according to [Virchow] is due to the synostosis of the *tri-basilar bone—that is to say, of the spheno-basilar suture, and the suture of the body of the anterior sphenoid and the posterior sphenoid.1890H. M. Stanley Darkest Africa II. xxi. 22 *Tri-bladed and four-bladed knives were shown to me.1901Science 6 Dec. 891/2 A possible basis for a division of the ‘*triblastic’ animals into two parallel but independent series.1870Hooker Stud. Flora 305 Flowers..in 1- or more-flowered *3-bracteate spikelets.Ibid. 321 Flowers..minutely *3-bracteolate.1834Medwin Angler in Wales I. 258 Along the *tri-breakered sea-shore.1897Proc. Zool. Soc. 2 Feb. 198 Dorsal scales very strongly *tricarinate.1802Shaw Gen. Zool. III. 54 *Tricarinated Tortoise.1872Oliver Elem. Bot. ii. 253 A *tricarpellary pistil.1900B. D. Jackson Gloss. Bot. Terms, *Tricarpellate.[1859Page Handbk. Geol. Terms, *Tricarpellites.., fossil nut-like fruits from the London clay, so called from their consisting of three carpels or seed-cells.]1882Ogilvie, Tricarpellite.1891Cent. Dict., *Tricarpous.1860Mayne Expos. Lex., Tricaudalis, having three tails; three-tailed: *tricaudal.1891Cent. Dict., *Tricaudate.Ibid., *Tricellular.1900in B. D. Jackson Gloss. Bot. Terms.1642H. More Song of Soul ii. iii. ii. vi, The second way that makes the soul *tricentrall.Ibid. i. viii, The *Tricentreity Of humane souls.191319th Cent. Aug. 284 The dual monarchy is not only bicephalic..but..*tricephalic.1891Cent. Dict., *Tricephalous.1907Daily News 13 Mar. 2 The *Tri-Church Conference of the Congregational, United Brethren, and Methodist Protestant Churches of the United States.1865Pall Mall G. 15 June 9 The *tricolumnar ‘Historicus’ favours the Times at his usual length with a letter.1892Athenæum 4 June 725/1 Fifty-six pages of index, mostly tricolumnar.1962M. Hardwick Sherlock Holmes Compan. 199 Watson's astonishing statement about his *tri-continental experience of women.1966Economist 22 Jan. 299/1 The tricontinental conference held in Havana..will increase the prestige of Dr Castro.1819Keats Let. to G. & Georgiana Keats 13 Mar., The black badger with *tri-cornered hat.1903Bradford Antiq. July 348 Tricornered bits of wood.1727Bailey vol. II, *Tricornigerous.., bearing or having three Horns.1891Cent. Dict. cites Westwood for *Tricornute.1816G. S. Faber Orig. Pagan Idol. II. 502 The Mount of Olives; which he adopted as the local *tricoryphèan Meru or Ida of his apostasy.1861Bentley Man. Bot. (1870) 146 If a ribbed leaf has 3 ribs..it is said to be 3-ribbed or *tricostate.1828Brande in Lancet 14 June 323/1 Containing three [cotyledons], *tricotyled[on]ous.1974News & Courier (Charleston, S. Carolina) 19 Apr. 6-a/1 A municipal scramble for federal recreation funds is under way in the *tri-county.1978Detroit Free Press 5 Mar. 13/2 These centers cater to some 150,000 deaf adults in the tri-county area.1873Salmon Higher Plane Curves 245 If the ellipse cuts each side in two real points, then the quartic is *tricrunodal.1873Hooker tr. Le Maout's Bot. 915 The macrospores are marked on one hemisphere with a *tricrural line.1891Cent. Dict., *Tridiametral,..*Tridigitate.1881*Tridigital [see bidigitate].1900B. D. Jackson Gloss. Bot. Terms, Tridigitate,..thrice digitate, ternate.1811Shaw Gen. Zool. VIII. 105 *Tridigitated Kingfisher..is a native of New Holland;..the legs and feet red, with three toes only.1866Odling Anim. Chem. 25 Comparing *tri-elementary bodies of this kind with tri-elementary mineral substances.1835A. Burnes Trav. Bokhara (ed. 2) II. 162 The great *trifaced idol of Elephanta.1777Pennant Zool. (ed. 4) IV. 75 Tellina..*Trifasciated, with a very brittle shell.1802Shaw Gen. Zool. III. 542 Trifasciated Snake.1716M. Davies Athen. Brit. II. To Rdr. 41 Those reviving Hydra's and Triceptick or *Trifaucian Cerberus's have been often and are still daily baffl'd and defeated.1903Nature 5 Feb. 334/1 An inertia table..in which an aluminium ring was supported by a *trifilar suspension.1646Sir T. Browne Pseud. Ep. iii. xii. 132 Nor will the solitude of the Phænix allow this denomination, for many there are of that species, and whose *trifistulary bill and crany we have beheld our selves.1891Cent. Dict., *Triflagellate..*Trifoveolate.1860Worcester, *Trifloral.1771J. R. Forster Flora Amer. Septentr. 25 Ranunculus abortivus..*triflorous.1861H. Hagen Synopsis Neuroptera N. Amer. 193 Each side with a fuscous, *trifoveolated stripe.1929W. H. Carothers in Jrnl. Amer. Chem. Soc. LI. 2550 Among compounds having more than one functional group, those of the type x—R—y may be called bifunctional, R{pp}x3, *trifunctional, etc.1975Nature 10 Apr. 482/2 An essential feature is that some of these amino acids are trifunctional.1941Jrnl. Amer. Chem. Soc. LXIII. 3085/2 (caption) Schematic representation of a *trifunctionally branched three-dimensional polymer molecule.1676Phil. Trans. XI. 770 He makes an ingenious supposition of a *trigastrick muscle.1880Earle Philol. Eng. Tongue §420 The old adjective had..even a double set of *trigeneric inflections.1887W. Phillips Brit. Discomycetes 27 Sporidia 8, narrowly fusiform, bi- or *tri-guttulate.1840G. S. Faber Prim. Doctr. Regen. ii. vi. 140 You were thrice plunged into the Water,..symbolically exhibiting the *trihemeral continuance of Christ in the sepulchre.1866Treas. Bot., *Trihilate, having three apertures, as some sorts of pollen grains.1862Neale Hymns East. Ch. 32 Three co-eternal, co-enthroned,..*Tri⁓hypostatic Essence.1880Gray Struct. Bot. (ed. 6) 417/2 Pinnate leaves are unijugate, with a single pair of leaflets, bijugate, with two pairs, *trijugate, with three pairs [etc.].1819Pantologia, *Trijugous leaf,..a pinnate leaf with three pairs of leaflets.1856–8W. Clark Van der Hoeven's Zool. I. 192 Body anteriorly obtuse,..Mouth *trilabiate.1900B. D. Jackson Gloss. Bot. Terms, *Trilamellar.1822J. Parkinson Outl. Oryctol. 186 One [tooth of the shell]..slightly *trilamellated.1889Cent. Dict., *Trilaminar.1971New Scientist 1 Apr. 24/1 (caption) Electron micrographs of mitochondrial membranes reveal a trilaminar or railway track appearance.1977Jrnl. Protozool. XXIV. 18/1 The trilaminar construction of the ciliate cortex.1882Sladen in Jrnl. Linn. Soc. XVI. 243 The spinelets are..regularly *trilaminate.1844Tupper Crock of G. ii, A ricketty triangular and *trilegged table.1902Westm. Gaz. 6 Aug. 6/1 A new telegraphic code has been invented..known as Baldrey's *Tri-Letter Code... Every word in any language is represented by three letters only.1909Cent. Dict. Supp., *Trilophous.1891Cent. Dict., *Trimastigate.1626Prynne Perpet. Regen. Man's Est. 331 A threefold and *trimembred objection.1875C. C. Blake Zool. 108 The larynx is *trimuscular.1623Cockeram, *Trinoctial, belonging to three nights.1880Muirhead Gaius Digest 623 Manus,..avoidance of it by trinoctial interruption.1887W. Phillips Brit. Discomycetes 254 Sporidia..*3-nucleate or pseudo-septate.1918Jrnl. Chem. Soc. CXIV. i. 48 The simultaneous liberation of the *trinucleotide, triphosphonucleic acid, and the mononucleotide, uridine-phosphoric acid, indicates that the three constituent mononucleotides in triphosphonucleic acid must be combined in a different manner from the uridine-phosphoric acid in the parent molecule of yeast⁓nucleic acid.1974Nature 25 Oct. 734/2 The two RNAs are known to contain an identical trinucleotide at their 5′ terminal.1844Tupper Heart iv, Men..being neither naturally monocular nor *triocular.1900B. D. Jackson Gloss. Bot. Terms, *Tri⁓operculate.1891Cent. Dict., *Triovulate.1866Treas. Bot. 1172 *Tripaleolate, consisting of three pales or paleæ, as the flower of a bamboo.1891Cent. Dict. cites H. Allen for *Tripapillated.1951Cold Spring Harbor Symp. Quantitative Biol. XVI. 471/2 Important information about genetic recombination comes from experiments in which the frequency of *triparental recombination is measured.1961Genetics XLVI. 1314 Occurrence of triparental recombinants between two Hfr and one F- has been demonstrated in E. coli K-12.1976Ann. Rev. Microbiol. XXX. 517 Nonconjugative plasmid transfer by such triparental matings may occur under ideal laboratory conditions.1907Daily Chron. 11 Mar. 4/4 The great danger ahead of Australia is..her *tri-party system of government, which places parties in office that do not command the confidence of the country.1883Schaff Hist. Chr. Church (ed. 2) I. §16. 130 Three theories [of the length of Christ's public ministry],..designated as bipaschal, *tripaschal, and quadripaschal schemes, according to the number of Passovers.1900Engineering Mag. XIX. 778/2 The Central Station of the ‘*Tri-Phase’ Company at Asnières, Seine..which will furnish tri-phase currents to Paris.1901Buck's Handbk. Med. Sc. III. 105 In the frog's heart the variation shown by the capillary electrometer is diphasic. For the human heart the later work seems to show a *triphasic current.1900B. D. Jackson Gloss. Bot. Terms, *Triphyletic,..used of hybrids containing the blended strains of three species.1605Sylvester Du Bartas ii. iii. iii. Lawe 487 'Gainst the *tri-pointed wrathfull violence Of the drad dart.1865Mansfield Salts 33 The general idea of a *tripolar compound, the simplest form of which is supposed to be water.1894Bateson Variation xvi. 430 Tripolar division of nucleus in embryonic tissue of Trout.1902E. R. Lankester in Encycl. Brit. XXV. 700 Arthropoda—Hexapoda. Head shown by its early development to be *triprosthomerous.1841Civil Eng. & Arch. Jrnl. IV. 118/2 Only the portico part of the temple (a Corinthian hexastyle, *triprostyle) advanced into the enclosed area in front.1897M. H. Dziewicki Wyclif's De Logica III. Introd. 23 If the Equator consist of *tripunctal atoms, it cannot be a circle.1841Penny Cycl. XX. 74/2.1872Nicholson Palæont. 491 Oval or elliptical *tripunctate areoles.1826Kirby & Sp. Entomol. IV. xlvi. 287 An ocellus is called bipupillate, *tripupillate, etc., when there are two, three, etc. of these spots.1896C. W. Crockett Elem. Plane & Sph. Trigon. 126 A *triquadrantal triangle has three sides each equal to a quadrant.Ibid., A *tri⁓rectangular triangle is also triquadrantal.a1886Ferguson Ogham Inscript. (1887) 153 This symbol in a bi-sceptral form traverses the crescent; in a *tri-sceptral form, the other emblem.1792J. Barlow Conspir. Kings 78 The *tri⁓sceptred prince, of Austrian mould... Theresa's son.1894*Trisensory [see bisensory a.].1895Edin. Rev. Jan. 108 A ‘trisensory hallucination’, ‘visual’, ‘auditory’, and ‘tactile’.1903F. W. H. Myers Human Personality I. 254.1830Lindley Nat. Syst. Bot. 286 *Tri⁓sepalous calyx.1874Cooke Fungi 27 The spores..at first unilocular, but afterwards *triseptate.1860Worcester, *Triserial, *Triseriate (Bot.), in three rows, one below another. Gray.1866Treas. Bot. 1174 Triserial, in three rows.1891Cent. Dict., *Triserially, in three series; so as to be triserial.1613Heywood Silver Age iii. Wks. 1874 III. 156 The triple-headed dogge..Hels *tri-shap't porter.1891Cent. Dict., *Trisinuate.1849Johnston in Proc. Berw. Nat. Club II. No. 7. 366 The frontal margin *trisinuated.1760J. Lee Introd. Bot. ii. (1765) 159 Rhamnus, with a *trispermous Fruit.1819G. Samouelle Entomol. Compend. 93 Interior antennæ with the first joint of the peduncle *trispinose.1828Stark Elem. Nat. Hist. II. 162 Thorax granulated, carinated, *trispinous.1826Kirby & Sp. Entomol. IV. xxxvii. 4 Called the great sympathetic, the intercostal, or *trisplanchnic nerves.1857Dunglison Med. Lex., Trisplanchnic Nerve... Great sympathetic, Inter⁓costal, Ganglionic or vertebral nerve.1866Treas. Bot. 1174 *Trisporic.1891Cent. Dict., *Trisporous.Ibid., *Tristachyous.1963Times 15 Jan. 9/6 A *tri-state transportation committee is carrying out a survey..of New York, New Jersey, and Connecticut.1983Listener 22 Sept. 5/2 The attractions of the US market—and the New York tri-state area in particular—have been appreciated for a long time.1891Cent. Dict., *Tristigmatic..*Tristigmatose.1900B. D. Jackson Gloss. Bot. Terms, Tristigmatic.1891Cent. Dict., *Tristylous.1900in B. D. Jackson Gloss. Bot. Terms.1817Jas. Mill Brit. India I. ii. vi. 279 The *tri⁓verbal phrase, and the triliteral syllable.1768Blackstone Comm. III. xxvi. 424 In the Roman calendar there were in the whole year but twenty eight judicial or *triverbial days allowed to the praetor for hearing causes [note, Otherwise called dies fasti, in quibus licebat praetori fari tria verba, do, dico, addico].1871Huxley Anat. Vertebr. Anim. viii. 341 The last cervical and the anterior dorsal vertebræ [in Glyptodon] are ankylosed together into a single ‘*tri-vertebral’ bone.1863Ibis Jan. 15 Acc[ipiter] nisoides..closely resembles the preceding one, A. nisus, but is smaller, with *trivirgate throat.1857Reade Course of True Love 191 Paper is not absolutely valueless, whatever the *trivoluminous may think.1892Athenæum 31 Dec. 914/2 In tri-voluminous fiction.1867Cayley Math. Papers VI. 485 On the *Trizomal Curve and the Tetrazomal Curve.1840R. Horne Gregory VII, v. iv. (ed. 2) 100 *Tri-zoned Jove's star-set eternity.2. a. Triply; three times; in three ways, directions, etc. triˈcurvate, ‘curved in three directions, as a sponge-spicule’ (Funk's Stand. Dict.). ˈtriequal, consituting three that are equal. trigoˈneutic a. [Gr. γονεύειν to generate], producing three broods in a year, as certain insects (cf. trivoltine in 4 b); so trigoˈneutism. triˈlarcenous, three times convicted of larceny. triˈquadrifid Bot. [quadrifid], having three lobes each deeply divided into four segments. triˈquinate Bot. [quinate], having three lobes each divided into five. ˈtrisonant [L. sonānt-em sounding], sounding in three ways; in quot. loosely, comprising three classes of vocal sounds. trisquare |ˈtraɪskwɛə(r)|, ‘three-square; having three equally wide plane faces’ (Cent. Dict. Suppl. 1909). triˈtactic Geom. [L. tact-, ppl. stem of tangĕre to touch: cf. tactic a.2], having or involving three coincident points of contact. Also triternate. b. spec. in Cryst. denoting forms having three ranges of facets, the number in each range being expressed by the second element: as tri-dodecaˈhedral (12), tri-hexaˈhedral (6), tri-octaˈhedral (8); also tri-rhomˈboidal, having eighteen faces occupying the positions of those of three different rhomboids.1805–17R. Jameson Char. Min. (ed. 3) 205 *Tri-dodecahedral red silver-ore..a six-sided prism, acuminated on the extremities with three planes, and truncated on all the edges.1839Bailey Festus v. (1848) 44 Injustice, hate, uncharitableness, *Triequal reign round earth, a Trinity of Hell.1805–17R. Jameson Char. Min. 204 *Trihexahedral,..when [the crystal's] surface consists of three.. ranges of planes, disposed six and six above each other... Tri-hexahedral nitrate of potash..; a six-sided prism, acuminated on both extremities with six planes.1823Syd. Smith Botany Bay Wks. (1850) 369 The man of three juries, who has three times appeared at the Bailey, *trilarcenous.1805–17R. Jameson Char. Min. 205 *Tri-octahedral sulphat of lead,..a four-sided pyramid,..the edges of the common base truncated, the angles on it very deeply bevelled, the bevelling planes set on the lateral edges, and the bevelling edges again deeply truncated, so that the crystal..consists of three rows of planes, of which each row contains eight planes.1833Hooker J. E. Smith's Eng. Flora V. i. 113 The upper leaves..are *tri-quadrifid.1891Cent. Dict., *Triquinate.1805–17R. Jameson Char. Min. 202 *Tri-rhomboidal; this, in the Wernerian Crystallography, is a double six-sided pyramid, with alternately broad and narrow lateral planes,..and..acuminated on the extremities with three planes, which are set on the smaller lateral planes. Example, Tri-rhomboidal calcareous-spar.1876T. Le M. Douse Grimm's L. xlvii. 97 The priority of any one of the known *tri-sonant systems over the others is untenable.3. In combination with an adj. (usu. in -ly) derived from a n. denoting a period of time: Comprising three ―, lasting three ―, occurring or appearing every three (days, etc.); also (loosely) occurring three times (a day, etc.); those in -ly are also used as advbs. = every three (days, etc.) or three times a (day, etc.): as tridaily; triˈhoral [L. hora hour]. See also trimonthly, -weekly; triannual, -diurnal, etc.1887Science IX. 79 The system of *tridaily [meteorological] observations.1860Worcester cites Ld. Ellesmere for *Trihoral.II.4. Forming ns., with the senses: a. Something consisting of or equivalent to three (of the things denoted by the second element); a triple ―. ‖ triaˈchænium (irreg. -akenium) Bot. [mod.L: see achene], a fruit composed of three achenes. ˈtriaster Biol. [Gr. ἀστήρ star: cf. diaster], a figure bearing some resemblance to three conjoined stars, resulting from a tripolar division of a nucleus. † tricube Math. Obs., the third power of a cube, a ninth power. † tridiaˈpason Mus. Obs. [diapason 1], an interval of three octaves, a twenty-second. † trifluctuˈation Obs. [L. fluctus wave]: see quot. trihemiˈobol [Gr. τριηµιωβόλιον], an ancient Greek coin of the value of 1½ obols. triˈjunction, a junction or union of three. † triˈmillion, the third power of a million; also (quot. 1707) a thousand thousand millions, i.e. a billion (= trillion in both senses: cf. etymology of billion). ˌtrimillioˈnaire [after millionaire], a person possessed of three millions of money (pounds, dollars, francs, etc.). ˈtripair Math., a set of three pairs. † triˈpapalty [papalty], a period during which there were three rival popes. † triˈquadrate Math. Obs. [quadrate n.1 1 b], the third power of a square, a sixth power. tristigm |ˈtraɪstɪm| Geom. [Gr. στίγµα prick, point], a system of three points with the straight lines connecting them (Cent. Dict. Suppl. 1909). b. Something having, or related in some way to, three (of the things denoted or indicated by the second element). ˈtri-axle, a trailer or articulated lorry with three (rear) axles. tricephal |traɪˈsɛfəl| [Gr. τρικέϕαλος adj., f. κεϕαλή head: see tricephalic in I. 1 a], a three-headed figure or image of a deity. ‖ triˈorchis [mod.L., f. Gr. ὄρχις testicle; cf. τριόρχης]: see quot. 1857. ˈtriplane, an aeroplane with three supporting planes; also attrib. triquaˈternion Math., an expression of the form q1 + ωq2 + µq3, where q1, q2, q3, are quaternions, and ω and µ are commutative with quaternions. ˌtrisacramenˈtarian, one who recognizes three and only three sacraments. triˈvoltin(e) [It. volta turn, time], a silkworm of a breed which yields three cocoons in a year. c. Something (denoted by the second element) having three of some characteristic part, or related to three things. tri-car (-machine, -mobile, -motor-car), a motor-car with three wheels; a motor tricycle with a seat for a person or a carrier for luggage in front. triˈceptor Phys. Chem. [L. -ceptor = captor taker], an intermediary body having three haptophorous groups. triˈcoaster, a combination of a three-speed gear with a ‘coaster’ brake on a cycle. ˈtri-mix, a breathing mixture for deep-sea divers composed of nitrogen, helium, and oxygen. † tri-pluˈrality, a plurality in which three benefices are held at once. triˈpyramid Cryst., a triangular pyramid, as a form in certain calcareous spars. tri-schism (nonce-wd.), schism of three parties. tri-spear (nonce-wd.), a trident.1882Ogilvie, *Triachenium, triakenium.1900B. D. Jackson Gloss. Bot. Terms, Triachænium.1894Bateson Variation i. xvi. 431 note, A case of the presence of *triasters in two bilaterally symmetrical tracts of the blastoderm of Loligo.1909J. W. Jenkinson Experim. Embryology 30 Triaster, a tripolar figure with three spindles.1971M. Tak Truck Talk 173 *Triaxle, a semi with three rear axles and consequently a greater weight-carrying allowance.1978Detroit Free Press 16 Apr. f 8/1 (Advt.), Trailer: 1967 Ravens 29′ dump on 34′ frame, tri-axle with air-lift.1981Daily Tel. 10 Dec. 9 (caption) A..38-tonne tri-axle lorry.1903Motor 6 May 279/1 (heading) The new Rex ‘*Tricar’.1904Sat. Rev. 20 Feb. 228/1 The development of the tri-car is especially important.Ibid., There is a great future for the useful tri-car.1906Westm. Gaz. 21 Aug. 4/2 Experience is going to show that the final form of the tri-car for delivery purposes will be of a very different pattern.1888Rhŷs Hibbert Lect. i. 81 note, The wide distribution of the *tri⁓cephal has induced M. Mowat to declare for the improbable hypothesis, that it was..but the Roman Janus..naturalized in Gaul.1902Vaughan & Novy Cellular Toxins (ed. 4) 132 The intermediary body [usually an] ‘amboceptor’,..may be a *triceptor, quadriceptor, etc.1908Daily Chron. 21 Nov. 9/4 He made use of the Sturmey-Archer *Tri⁓coaster, which is the three-speed gear in association with a foot-acted brake.1674S. Jeake Arith. (1696) 273 Some to shorten..the long Names of..Higher Powers..call..ϕϕ a Bicube, ϕϕϕ a *Tricube &c.1811Busby Dict. Mus. (ed. 3), *Tri-Diapason.1646Sir T. Browne Pseud. Ep. vii. xvii. 377 τρικυµία..is a concurrence of three waves in one, whence arose the proverb, τρικυµία κακῶν, or a *trifluctuation of evils.1887B. V. Head Hist. Numorum 336 There are also *trihemiobols..of later style, for the Pegasus on the obverse has pointed wings.1887Athenæum 29 Jan. 164/2 To have the *trijunction of Tibet, India, and Burma focussed within the four corners of a map.1707Curios. in Husb. & Gard. 155 These ten Thousand Willows..will produce each of them likewise a hundred more. Thus we have a Million; then a hundred Millions: next come the Tens of Bimillions; then the *Trimillions.1806[see trillion].1848Tait's Mag. XV. 646 A *tri-millionaire buys it for a deer-forest.1976Jrnl. Appl. Physiol. XL. 605/2 Each subject..breathed either air or a mixture of 36% helium, 21% oxygen, and 43% nitrogen (*tri-mix) during cycles of immersed work.1981New Scientist 12 Feb. 390 Last week a team of divers..broke the world record for a simulated dive, experiencing pressures equivalent to those 686 metres beneath the sea surface... Part of the secret of the test's success was that the divers breathed a recently developed gas mixture, called trimix.1905Westm. Gaz. 28 Dec. 7/3 Returning home in a *tri-motor-car.1650H. More Observ. in Enthus. Tri., etc. (1656) 92 If you have not a sleight of Art to Metamorphize your selves into *Triorchises.1857Dunglison Med. Lex., Triorchis, one who has three testicles.1878Cayley Math. Papers X. 450 We have thus..a system of..63 hexpairs; and selecting at pleasure any three pairs out of the same hexpair, we have a system of (63 × 20 = ) 1260 *tripairs.1651N. Bacon Disc. Govt. Eng. ii. xvii. (1739) 89 During the *Tripapalty much money had been levied..to serve for the recovery of the Popedom to one of an English interest.1908Times 3 Oct. 6/3 Experiments with a *triplane machine.1909Westm. Gaz. 4 Mar. 4/2 In machines of the biplane and triplane types.1909Triplane [see quadruplane].1920Glasgow Herald 10 July 5 The Pullman triplanes of the British Company carry 18 people.1977J. Cleary High Road to China ii. 47 ‘What did you fly?’.. ‘Albatros D's and Fokker Triplanes. I was with von Richthofen.’1425Rolls of Parlt. IV. 290/2 That mony a Parsone..have pluralite, and somme *tripluralite.[1753Chambers Cycl. Supp., *Tripyramides,..the name of a genus of spars... The bodies of this genus are spars, composed of single pyramids, each of three sides,..affixed by their bases to some solid body.]1828Webster, Tripyramid.1674S. Jeake Arith. (1696) 273 Some..call ᵹᵹ a Biquadrate, ᵹᵹᵹ a *Triquadrate.1902G. Combebiac cited in Cent. Dict. Supp. for *Triquaternion.1727–41Chambers Cycl., *Trisacramentarians,..a sect..who admit of three sacraments, and no more... There have been several trisacramentarians among the protestants, who allowed of baptism, the eucharist, and absolution, as sacraments.1896J. H. Wylie Hist. Eng. Hen. IV, III. 388 Instead of schism, *tri-schism, which threatened to become centi-schism.1887Morris Odyss. v. 292 His hand the *tri-spear grasping.1888*Trivoltin [see bivoltine a.].III. 5. In Chemical nomenclature, in the names of compounds and derivatives, with general sense ‘three’, ‘three times’. a. Prefixed to names of compounds of elements, radicals, or groups, names of salts, etc., to signify three atoms, groups, or equivalents of these elements or radicals in combination with another element or radical; e.g. tribromide, a compound of 3 atoms of bromine with another element or radical, as tribromide of boron; trisulphate, a compound of three SO4 groups with a metal or radical (or in earlier nomenclature of three SO3 groups with a basic oxide). So trichloride, -cyanide, -fluoride, -hydride, -iodide, -oxide, -sulphide (tri-sulphuret); -carbonate, -chlorate, -cyanate, -hydrate, -phosphate, -thionate, etc. Also in names of some organic compounds, referring to their composition, as triamide, triamine, and the compound ethers or esters of glycerin with acids, as triacetin, tri-butyrin, -palmitin, -stearin, etc.; triˈterpane, a terpane with the formula C30H60, analogous to the triterpenes; triˈterpene, any of the group of terpenes of formula C30H48, found in plant gums and resins; also, a triterpenoid; triˈterpenoid, a triterpene or a derivative of one. See also triacetate, trisilicate.In early nomenclature, tri- or tris- prefixed to the name of a salt meant 3 molecules not of the acid, but of the base; thus 3PbO.C4H5O3 was called tris- or tri-acetate of lead; similarly B3O was called trioxide of any element B.1826Henry Elem. Chem. I. 591 Tri-phosphate of lime.1850Daubeny Atomic Theory (ed. 2) 112 When the number of proportionals of base is 2, the prefix di or dis is adopted; when 3, tris; when four, tetrakis{ddd}trisilicate of iron, 3 of base to 1 of silicic acid.1850Ibid. 338 The gaseous trifluoride of boron, which contains no hydrogen.1856Fownes Chem. (ed. 6) 607 Three compounds of stearic acid with glycerin..which M. Berthelot distinguishes as monostearin, bistearin, and tristearin.1863–72Watts Dict. Chem. I. 895 The metals which form trichlorides are antimony, arsenic, bismuth, gold, molybdenum, thallium, vanadium, and probably indium.1866Roscoe Elem. Chem. xvi. 142 Arsenic unites with chlorine, bromine, and iodine, to form arsenic trichloride, tribromide, and triiodide.Ibid. xxiv. 207 Metallic antimony occurs native, but its chief ore is the trisulphide.1880Roscoe & Schorlemmer Chem. II. ii. 319 Antimony Trifluoride, SbF3, is obtained as a dense snow-white mass, by distilling antimony with mercury fluoride.1902F. J. Pond tr. Heusler's Chem. Terpenes 432 Several well characterized compounds which occur in elemi-resin belong to the class of triterpenes.1932Chem. Abstr. XXVI. 3244 (heading) Contribution to the accurate determination of the empirical formulas of several triterpenes and triterpenoids.1945Triterpene [see isoprenoid a. and n.].1965Proc. Nat. Acad. Sci. LIV. 1406 We wish to report now the isolation and identification of..a C30-pentacyclic triterpane from the branched⁓cyclic alkane fraction of the Green River Shale.1978Triterpene [see stevioside].1978Nature 16 Mar. 217/1 Polycyclic triterpenoids are found in petroleum and their presence was at first taken as evidence of non-marine contribution, as they had been detected in the lipid extract of ferns.1981Jrnl. Chromatogr. Sci. XIX. 156/1 This study deals with the apparent effect that maturation has on the relative concentration of individual triterpanes [etc.].b. Prefixed to adjs., or to ns. used attrib., in the names or descriptions of acids, alcohols, compound ethers or esters, oxides, salts, etc.; e.g. trisodic or trisodium, (a salt) containing 3 atoms of sodium; triethylic or triethyl (a compound) containing 3 ethyl groups; triethylene, containing three non-contiguous ethylene radicals in the molecule. So trihydric or trihydrogen, tricalcic or tricalcium, triargentic or tri-silver, tricarbon, trichloric, trimethylic or trimethyl, triplumbic, trithionic, triacetic, etc.1866Odling Anim. Chem. 108 We meet with still less oxidised tricarbon molecules.1869Roscoe Elem. Chem. xv. 154 The three atoms of hydrogen in trihydrogen phosphate may be replaced by three different metals.1873Watts Fownes' Chem. 340 A trisodic orthophosphate, sometimes called subphosphate.Ibid. 451 Triplumbic tetroxide, or Red lead.1888Muir & Morley Watts' Dict. Chem. I. 99 Alcohols are classed as monohydric, dihydric, trihydric..according to the number of hydroxyl-groups which they contain.1920Jrnl. Chem. Soc. CXVII. 1090 (heading) Triethylene tri- and tetra-sulphides.1953, etc. [see thiotepa s.v. thio- 1].1962J. H. Burn Drugs, Med. & Man xix. 193 Tri-ethylene melamine..is used in the textile industry... It is now widely used in the treatment of Hodgkin's disease.c. Prefixed to the names of elements or radicals, or their combining forms (as azo-, bromo-, chloro-, hydro-, hydroxy-, iodo-, nitro-, oxy-, sulpho-, thio-: see these) entering into the name of a compound, to signify that three atoms or groups of the element or radical are present, or are substituted for hydrogen, in the substance designated by the rest of the name: as triˌbromoˈbenzene, C6H3Br3, in which three of the hydrogen atoms of benzene, C6H6, are replaced by three bromine atoms; so trimethylbenzene, C6H3(CH3)3; triˌethylˈcarbinol, C(C2H5)3OH; triˈmethylamine, N(CH3)3; trichlorhydrin, C3H5Cl3; so tribromhydrin, etc. Combinations of this kind are formed when wanted, and are unlimited in number: only a few are mentioned in this work: see tribrom-, trichlor-, etc. Illustrated below are: tributyl phosphate, an oily liquid, (C4H9O)3PO, that is a solvent used as a plasticizer and in the solvent-extraction of nuclear fuels; triˈcresyl phosphate [cresyl], a colourless liquid, (CH3C6H4O)3PO, used as a fuel additive, plasticizer, and fire retardant; ˌtriethaˈnolamine [ethanolamine], an oily alkaline liquid alcohol, (HOCH2CH2)3N, used as a solvent and a stabilizer; trihydroˈcalcite Min. [ad. Russ. trigidrokal′tsit{pp} (P. N. Chirvinsky 1906, in Ezhegodnik{pp} po Geol. i Mineral. Rosīi VIII. 241/1)], a trihydrate of calcium carbonate, CaCO3.3H2O, the natural occurrence of which is uncertain; ˌtriiodoˈthyronine Biochem. [thyronine], a thyroid hormone similar to thyroxine (tetraiodothyronine) but having greater potency; HO·C6H3I·O·C6H2I2·CH2CH(NH2)COOH.1930Brit. Patent 330,228 1/2 The excess of alcohol and later the tributyl phosphate are distilled off in vacuo.1957Financial Times Ann. Rev. Brit. Industry 69/1 The concentrate is dissolved in nitric acid..where it is extracted with tributyl phosphate, producing uranium.1882Jrnl. Chem. Soc. XLII. 839 The authors have thus obtained triphenyl, tri-β-naphthyl and tricresyl phosphate from the corresponding phenols.1959Economist 10 Jan. 153 (Advt.), The Ignition Control Additive based on tricresyl phosphate..was developed..to overcome serious problems of power loss and rough running.1962Punch 15 Aug. 218/3 Tricresyl phosphate was a chemical similar to triorthocresyl phosphate.1897Jrnl. Chem. Soc. LXXII. 314 (heading) Triethanolamine (trihydroxytriethylamine).1939Jrnl. R. Aeronaut. Soc. XLIII. 617 Strips of brass sheet were..immersed respectively in pure glycol, commercial glycol and commercial glycol treated with triethanolamine phosphate.1976New Yorker 8 Mar. 67/1 (Advt.), Its mild ‘heavy-molecular’ triethanolamine-base formulation is chemically balanced to remove surface dirt and makeup without penetrating and robbing the sub⁓layers of the skin.1910Mineral. Mag. XV. 432 Tri⁓hydrocalcite... Hydrated calcium carbonate, CaCO3.3H2O, occurring as a mould-like encrustation on chalk⁓marl near Nova-Alexandria.1928, etc. Trihydrocalcite [see pentahydrocalcite s.v. penta-].1952Lancet 1 Mar. 439/1 (heading) The identification of 3:5:3′-L-triiodothyronine in human plasma.1975Jrnl. Endocrinol. LXIV. 573 In the present culture system the thyroid hormones (tri-iodothyronine and thyroxine) inhibited the action of PTH.d. In verbs and their pples. derived from ns. as in a, as tribrominated, trichlorinated, in which three hydrogen atoms have been replaced by atoms of bromine or chlorine; trihydrated, containing three molecules of water.1857Miller Elem. Chem. III. 47 Trichlorinated Dutch Liquid.1868Trihydrated: see trihydrate.IV.6. Forming verbs (and derivatives), as tri-fallow, trisect, trisection, q.v.Add:[I.] [1.] [a.] triˈcolpate a. Bot. [Gr. κόλπος fold], of pollen grains: having three furrows.1928R. P. Wodehouse in Ann. Bot. XLII. 901 This character, viz. the possession of three longitudinal expansion folds, I have described as *tricolpate.1961A. J. Eames Morphol. Angiosperms v. 162 The tricolpate grain, with three meridional furrows, is apparently the basic type in dicotyledons.1989Nature 9 Nov. 131/2 The four higher dicot subclasses all have multi-aperturate pollen ultimately derived from the distinctive tricolpate type.[2.] [a.] tri-ˈD a. (also tri-ˈdi)= tri-dimensional a.; with capital initial, a proprietary name in the U.S. for a range of computer equipment; cf. three-D s.v. three a. III. 2.1955F. Pohl in Galaxy Sci. Fiction Apr. 77/2 Marin was already setting up his co-ordinates... ‘I have the time now... But the *tri-di readings are hard.’1979D. Adams Hitch-Hikers' Guide Galaxy iv. 35 They watched his every gesture through the eyes of a small robot tri-D camera.1981J. May Many-Colored Land i. xiii. 78 The screen went from black to living Tri-D color in an orbiter's view of Pliocene Earth, six million years..backward in time.1989Official Gaz. (U.S. Patent Office) 1 Aug. tm51/2 Tri-D... For computers, computer peripherals and parts therefor... First use 10-31-1988; in commerce 10-31-1988.[III.] [5.] [b.] trihydroxy, containing three hydroxyl groups.1895Jrnl. Chem. Soc. LXVIII. i. 126 Two isomeric *trihydroxy-acids are formed by the oxidation of ricinoleïc acid with potassium permanganate.1965Phillips & Williams Inorg. Chem. i. xvii. 626 On gentle heating the hydrogen or the boron is substituted to give B-trihydroxy, B-trimethoxy, or B-trihalogenoborazines.c. triacylˈglycerol n. = triglyceride n.1966Lipids I. 467 (Index), *Triacylglycerol.1967Information Bull. Internat. Union Pure & Appl. Chem. XXX. 23 The terms triacylglycerol, diacylglycerol are preferred for neutral fats, not only for consistency, but mainly because strict interpretation of the traditional (optional) terms triglyceride, diglyceride does not convey the intended meaning.1988P. W. Kuchel et al. Schaum's Outl. Theory & Probl. Biochem. xiii. 359 Fatty acids are important cellular fuels and are stored as triacylglycerols in adipose tissue.trihaloˈmethane n. [halo-], any of the compounds formed by the substitution of halogen atoms for three of the hydrogen atoms of methane.1968Chem. Abstr. LXVIII. 744/1 The abs. intensity, A, of the ir [sc. infrared] absorption band corresponding to the vibration ν-(CH) of the *trihalomethanes has been related to the electronegativity of the halogen groups and to the charge σ of the C atom.1975Jrnl. Amer. Water Works Assoc. LXVII. 644/3 The four trihalomethanes were not found or were present in low concentrations in the raw waters tested.1989What Food? Sept. 7/2 Trihalomethanes (THMs)..are formed when untreated water containing organic matter is disinfected with chlorine.
tri-
word-forming element meaning "three, having three, once every three," from Latin tres (neuter tria) or Greek treis, trias "three" (see three).
tri- /trʌɪ/ prefix.
ORIGIN: Latin, Greek, combining form of Latin tres three, Greek treis three, tris thrice.
Used in words adopted from Latin and Greek and in English formations modelled on these, and as a productive prefix, forming (a) adjectives (and derived nouns and adverbs) with the senses ‘having, consisting of, or involving three’, as tricuspid, trilateral, triune, ‘triply, in three ways’, as triphibious, tripinnate, ‘lasting for three, appearing every three, or (with resulting ambiguity) appearing three times in a’, as triennial, trimonthly, tri-weekly; (b) nouns with the sense ‘triple, thing having or consisting of three’, as tricycle, trilogy, triplane; in chemical names indicating the presence of three atoms of an element or three similar radicals, as triacetate, trichloride, trinitrotoluene; (c) verbs (and derivatives) with the sense ‘into three’, as trifurcate, trisect.
 DERIVATIVE triactor noun (Canad.) a form of betting on racehorses in which triple success wins a big dividend L20.
triaˈllelic adjective (Genetics) having or involving three different alleles of a gene M20.
triˈapsal, triˈapsidal adjectives having three apses M19.
tri-axle noun a trailer or articulated lorry with three (rear) axles L20.
tri-band adjective (of a mobile phone) having three frequencies, enabling it to be used in different regions (typically Europe and the US) L20.
triˈbutyl adjective (Chemistry) having three butyl groups in the molecule; tributyltin, an organic radical, (C4H9)3Sn·, in which tetravalent tin is linked to three n-butyl groups; any compound containing this, some of which are used as pesticides esp. in paints and preservatives: M20.
tricarboˈxylic adjective (Chemistry) having three carboxyl groups in the molecule; tricarboxylic acid cycle, = Krebs cycle: L19.
tricarˈpellary adjective (Botany) consisting of or having three carpels L19.
trichloroaˈcetic, trichloracetic adjective (Chemistry etc.): trichloroacetic acid, trichloracetic acid, a toxic deliquescent crystalline acid, CCl3COOH, used as an insecticide, antiseptic, and astringent; abbreviation TCA: L19.
trichloroˈethylene noun (Chemistry & Pharmacology) a liquid organochlorine compound, CCl2=CHCl, used as a solvent, analgesic, and anaesthetic L19.
trichloroˈphenol noun (Chemistry etc.) each of six isomeric phenol derivatives having the formula C6H2Cl3(OH), used as insecticides, preservatives, and in the synthesis of various pesticides L19.
tricoˈlumnar adjective having or occupying three columns M19.
tricontiˈnental adjective embracing three continents M20.
triˈcornered adjective having three corners E19.
triˈcresyl adjective (Chemistry) having three cresyl groups in the molecule; tricresyl phosphate, a liquid, (CH3C6H4O)3PO, used as a fuel additive, plasticizer, and fire retardant (abbreviation TCP): L19.
triˈdactyl adjective having three fingers or toes E19.
triˈdactylous adjective (now rare) = tridactyl E19.
triˈfacial adjective (Anatomy, now rare) = trigeminal M19.
triˈfunctional adjective (Chemistry) having three functional groups in the molecule E20.
triˈglyceride noun (Chemistry) an ester of glycerol in which three acid radicals combine with each glycerol molecule, examples of which are the main constituents of naturally occurring fats and oils M19.
trigynous /ˈtrɪdʒɪnəs/ adjective (Botany) having three pistils L18.
trihaloˈmethane noun (Chemistry) any of the compounds formed by substitution of halogen atoms for three of the hydrogen atoms of methane (also called haloform) M20.
triˈhybrid adjective (a) Genetics of or pertaining to a hybrid that is heterozygous with respect to three independent genes; (b) involving or pertaining to a descent from three different races or types that interbred: E20.
triˈhydrate noun (Chemistry) a hydrate containing three moles of water per mole of the compound M19.
trihyˈdrated adjective (Chemistry) hydrated with three moles of water per mole of the compound M19.
triˈhydric adjective (Chemistry) (of an alcohol etc.) containing three hydroxyl groups M19.
triiodomethane noun = iodoform M20.
triiodoˈthyronine noun (Biochemistry) a thyroid hormone similar to thyroxine but having greater potency M20.
trijugate adjective [Latin jugum yoke, pair] (Botany) having three pairs of leaflets L19.
triˈlaminar adjective (Biology) having or consisting of three layers L19.
tri-level adjective & noun (N. Amer.) (a) adjective having or consisting of three levels; esp. (of a building) having three storeys or floors on three levels (cf. split-level s.v. split ppl adjective); (b) noun a tri-level building: M20.
triˈlineal adjective (long rare) = trilinear E18.
triˈlineate adjective (Zoology) marked with three lines or streaks E19.
triˈlocular adjective (Botany & Zoology) having three cells or compartments M18.
trimeˈllitic adjective (Chemistry): trimellitic acid, a colourless crystalline compound, C6H3(COOH)3, 1,2,4-benzenetricarboxylic acid, obtained by the oxidation of pseudocumene L19.
triˈmesic adjective (Chemistry): trimesic acid, a colourless crystalline compound, C6H3(COOH)3, 1,3,5-benzenetricarboxylic acid L19.
trimix noun a breathing mixture for deep-sea divers composed of nitrogen, helium, and oxygen L20.
triˈmodal adjective (chiefly Statistics) having three modes E20.
triˈmonthly adjective (a) occurring every three months; (b) lasting or extending over three months: M19.
trinitroˈcellulose noun cellulose nitrate, gun cotton L19.
trinitroˈphenol noun (Chemistry) a derivative of phenol in which three hydrogen atoms in the ring have been replaced by NO2 groups; esp. picric acid: M19.
trinoctial /-ˈnɒkʃ(ə)l/ adjective belonging to or lasting three nights E17.
triˈnodal adjective having three nodes M17.
triˈnucleotide noun (Biochemistry) an oligonucleotide containing three nucleotides E20.
trionymal /-ˈɒnɪm(ə)l/ adjective (rare) having three names; spec. = trinomial adjective 2: M17.
tripaˈrental adjective (Microbiology) involving or resulting from the simultaneous infection of a bacterium by three different bacteriophages M20.
triˈpetalous adjective (Botany) having three petals E18.
triphyˈletic adjective (Biology) derived from three different genetic stocks E20.
triˈradial adjective = triradiate L19.
triˈradiate adjective having or consisting of three rays; extending in three directions from a central point: M19.
triˈradius noun, pl. -radii /-ˈreɪdɪʌɪ/, in dermatoglyphics, a point from which dermal ridges radiate in three directions at roughly equal angles M20.
triˈsepalous adjective (Botany) having three sepals M19.
triˈseptate adjective having three septa or partitions L19.
triˈstearin noun [stearin] Chemistry the triglyceride formed by addition of three stearic acid residues to a molecule of glycerine, which is the chief constituent of tallow or suet M19.
triˈstylous adjective (Botany) having three styles or kinds of style L19.
triˈsubstituted adjective (Chemistry) having three substituents in the molecule E20.
trisulcate /trʌɪˈsʌlkət/ adjective having three branches, three-forked; Botany & Zoology marked or divided by three furrows or grooves: E18.
triˈternate adjective (Botany) biternate with the secondary divisions themselves being ternate M18.
triˈterpane noun (Chemistry) a terpane with the formula C30H60, analogous to the triterpenes M20.
triˈterpene noun (Chemistry) any of the group of terpenes of formula C30H48, found in plant gums and resins, or their derivatives E20.
triˈterpenoid adjective & noun (Chemistry) (designating) a triterpene or a derivative of one M20.
trituˈbercular adjective = trituberculate L19.
trituˈberculate adjective (Zoology) (of a tooth) having three cusps; characterized by such teeth: M19.
tri-
combining form.
having three _____:
Triangle = (a plane figure) having three angles. Trilogy = a group of three novels, plays, etc.
three _____s: Trisect = to divide into three parts.
once every three _____; lasting for three _____: Trimonthly = occurring once every three months.
containing three atoms, radicals, or other constituents of the substance specified, as in trioxide, trisulfate.
[< Latin, Greek tri-; < Latin trēs, tria or Greek treîs, tría three, or trís thrice]
tri
try, noun.
Informal. a trimaran.
tri-
combining form
Etymology: Middle English, from Latin; akin to Greek tri-, Latin tria three — more at three
1. : three
 < triarch >
 < triact >
: characterized by or having three or three parts
 < tricrotic >
 < tricycle >
 < tripod >
2. : three times or in three ways
 < trifarious >
 < trisonant >
also : into three
 < trisect >
3. : trice : every third
 < triweekly >
 < triennial >
4. : containing three atoms, radicals, or groups (of a specified kind)
 < tribromide >

tri- 1

  • IPA: /traɪ/

    • Prefix

    1. chemistry Used in combination with a known element name (e.g. 'tri-silicon') to designate an unknown element that would reside three periods lower than the known element on a Mendeleev-type periodic table. See Mendeleev's predicted elements.

    Etymology

    From Latin tri- (“three”) and Ancient Greek τρι- (tri-, “three”).

    Prefix

    Latin number prefix
    Previous: bi-
    Next: quadri-
    1. three

    Synonyms

  • ter-

    • Derived terms

    English words prefixed with tri-
  • triad
  • triadic
  • triage
  • triangle
  • triangular
  • triangulate
  • triannual
  • triathlete
  • triathlon
  • tribune
  • tricentennial
  • triceps
  • trichord
  • triclavianism
  • triclavianist
  • tricycle
  • trident
  • triennial
  • trifoliate
  • trigamy
  • trigon
  • trigonal
  • trigonometry
  • trihedron
  • trike
  • trilateral
  • trilemma
  • triliteral
  • trilobite
  • trimaran
  • trimester
  • trimillennial
  • trinitarian
  • trinitrotoluene
  • trinity
  • trinomial
  • trio
  • triode
  • triomino
  • tripartite
  • triplet
  • tripod
  • triptych
  • trireme
  • trisect
  • trisection
  • triterpene
  • triterpenoid
  • tritium
  • triumvirate
  • trivia

    • Related terms

  • tre-
  • ter-
  • -tri-

    • tri- 2

    Etymology

    From Sanskrit त्रि- (tri-, “three”).

    Related terms

  • eka-
  • dvi-

    • 前缀：tri- 表示“三”

    triangle 三角形（tri+angle角）

    tricycle 三轮脚踏车（tri+cycle轮子）

    triple 三倍的（tri+ple=ply表示增加）

    tripod 三脚架（tri+pod脚）

    前缀：tri- 三

    tricolour 三色的

    tricar 三轮汽车

    triangle 三角（形）

    trisyllable 三音节词

    trigonometry 三角学

    trilateral 三边的

    triatomic 三原子的

    trilingual 三种语言的

    triunity 三位一体

    triweekly 三周刊

    trisection 三等分

    trijet 三引擎喷气机

    前缀：tri-

    【词根含义】：三

    【同源单词】：triangle, triangular, triceratops, trilingual, trilogy
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    更新时间：2025/1/25 10:05:19