ecto-
pref.（前缀）
语源
pref.（前缀）
- Outer; external:
在外的；外部的：
ectoparasite.
体表寄生虫
语源
- Greek ekto-
希腊语 ekto- - from ektos [outside]
源自 ektos [外面的] - from ek, ek- [out] * see eghs
源自 ek, ek- [外的] *参见 eghs
ecto-
combining form
indicating outer, outside, external
⇒
ectoplasm
Origin
from Greek ektos outside, from ek, ex outecto-
Word Origin
1
a combining form meaning “outer,” “outside,” “external,” used in the formation of compound words:
ectoderm.
Also, especially before a vowel, ect-.
Origin
combining form of Greek ektós outside
Related Words
- ect-
- ectoblast
- ectocommensal
- ectocornea
- ectoderm
- ectoenzyme
ecto-a prefix (chiefly in biological words) meaning 'outside', 'outer', 'external', 'lying upon' (opposed to endo-, ento-), as in ectoderm.
[Greek ekto-, combining form of ektos outside]ecto-
combining form
⇨ see ect-
combining form
⇨ see ect-
ecto-
combining form
- outer; external; on the outside (used commonly in scientific terms)表示“外面”, “外部”（通常用于科学术语中）：
-
ectoderm
ectoparasite.
词源
from Greek ektos 'outside'.
1864 Webster, *Ecto-blast, the Membrane composing the walls of a cell.
1889 Cent. Dict. ,*Ectoblastic.
1902 Daily Chron. 16 Sept. 5/2A pair of ectoblastic invaginations.
1910 Practitioner Jan. 40 The core of the chorionic villus is mesoblastic in origin,..whereas the trophoblast is ectoblastic.
1854 Owen in Circ. Sc. (c. 1865) II. 74/2There are three calcaneal processes..the third, called ‘*ectocalcaneal’, from behind the ectocondyloid cavity and the ectometatarse.
1889 A. Macalister Text-bk. Hum.Anat. 38The mesoblastic tissue..is replaced by bone in either of two ways, which are called respectively *ectochondral and entochondral ossification.
1913 Cunningham's Text-bk. Anat. (ed. 4) 86Cartilage bones are those which are preformed in cartilage, and include most of the bones of the skeleton. Their growth is often described as endochondral and ectochondral, the former term implying the deposition of membrane bone in the centre of the cartilage, while the latter signifies a deposit of membrane bone on the surface of the cartilage.
1887 Sollas in Encycl. Brit. XXII. 415/1A transverse muscular sphincter, which defines an outer division or *ectochone from an inner or endochone.
1888 Rolleston & Jackson FormsAnim. Life 795The..chonae..are divided into an outer part, the ectochone, long and cylindrical, and an inner part, the endochone.
1854 Owen in Circ. Sc. (c. 1865) II. 74/1The ‘*ectocondyloid’ surface.
Ibid. 68/2A smaller ossicle..is the ‘*ectocuneiform’.
1873 Mivart Elem. Anat. v. 208The ecto-cuneiform may enormously preponderate over the other cuneiforms as in the Horse.
1880 Athenæum 23 Oct. 536/1 Each individual of a colony of Polyzoa is encased in a cell known as the *ectocyst.
1861 J. R. Greene Man. Anim. Kingd. , Cœlent. 11The *ectoderm growing from within outwards.
1879 tr. Haeckel'sEvol. Man I. iii. 67The upper germ-layer, from which the outer skin and the flesh proceed, Huxley named Ecto-derm, or Outer layer.
1877 Huxley Anat. Inv. An. i. 55The *ectodermal cells constitute the epidermis (ecderon).
1877 Foster Text-bk. Physiol. iii. 74The junction of the *ectodermic muscular process with the body of its cell. [ in Hydra]
1927 C. F. Marbut tr. Glinka's Great Soil Groups 34We propose to designate them as endo⁓dynamomorphic soils to distinguish them from the *ekto⁓dynamomorphic soils in which external factors predominate over the internal.
1930 Nature 19 July 89 Ektodynamomorphic soils, that is, those in which climatic and other external factors in soil formation predominate over internal ones.
1888 Rolleston & Jackson FormsAnim. Life 91Anteriorly to the septum is a large bone, the *ecto-ethmoid..( = the pre-frontal of Huxley).
1928 C. F. Cooper Parker & Haswell's Text-Bk.Zool. (ed. 4) II. 78The outer walls of the olfactory capsules may be ossified by paired ecto-ethmoids.
1884 Sedgwick & Heathcote tr. Claus'Zool. I. 112The first processes of segmentation in these at first *ectolecithal ova are withdrawn from observation, since they take place in the centre of an egg covered by a superficial layer of food yolk.
1905 Amer. Geol. Apr. 244The outer border (*ectoloph) rises higher than the cross crests.
1966 A. S. Romer Vert. Paleont. (ed. 3) xx. 239An ectoloph, forming the outer wall of the tooth, connecting paracone and metacone and often..with a W-shaped contour.
1889 Cent. Dict. ,*Ectomere.
1890 Billings Med. Dict. ,Ectomere, the larger of the two primitive cells produced by the segmentation of the mammalian ovum after impregnation.
1924 E. V. Cowdry Gen. Cytology 584The subdivisions of these ectomeres are much more numerous in large eggs than in small ones.
1909 A. Sedgwick Student's Text-Bk.Zool. III. iii. 123The ectodermal part of this plexus, which is continuous with the endodermal and may be called the *ectoneural, is especially concentrated in an annular tract round the mouth.
1962 D. Nichols Echinoderms ii. 28The main sensory part lies orally, and has been called the superficial oral or ectoneural system.
1861 Hulme tr. Moquin-Tandon ii. vi. 291Those Parasites which derive their nourishment from the skin..have..been named..*Ectoparasites.
1877 Huxley Anat. Inv. An. iv. 192Balatro an ectoparasite, upon oligochætous Annelids. [ is]
1870 Rolleston Anim. LifeIntrod. 42The Myxinoids..are..*ecto-parasitic.
1883 D. Macalister tr. Ziegler'sPath. Anat. i. 354*Ectophyte.
1902 Encycl. Brit. XXV. 439/1There is a reciprocal symbiosis between the Angiosperm and the fungus which is endophytic, only rarely *ectophytic.
Ibid. ,More or fewer of their rootlets have their extremities invested by a weft of hyphal mycelium as an ectophytic mycorhiza.
1877 Huxley Anat. Inv. An. viii. 460The characteristic polypide of the *ectoproctous Polyzoa is a structure developed from the cystid.
1872 Mivart Elem. Anat. 131The bony palate may be enriched by the addition..of two extra bones, the *ecto-pterygoid and the ento-pterygoid.
1890 Jrnl. Anat. XXV. 106The demarcation between these two parts is due to the presence of a fissure, more or less distinctly defined in different animals, which has been named the rhinal or *ectorhinal fissure.
1904 A. Keith Hum.Embryol. (ed. 2) 258Hippocampal and Ectorhinal Fissures.
1877 Huxley Anat. Inv. An. ii. 94Beneath this lies a thick cortical layer (*ectosarc) distinguished by its clearness and firmness from the semifluid central substance (endosarc).
1888 Sollas in ChallengerRep. XXV. p. xvi,This cleavage occurs parallel to the outer surface, dividing the sponge at once into a choanosomal and *ectosomal portion.
1887 Encycl. Brit. XXII. 415/1An outer or *ectosome and an inner or choanosome.
1959 Chambers's Encycl. XIII. 101/2The ectosome consists of a single-layered epithelium which may become several layers thick.
1868 W. K. Parker Monogr.Struct. &Devel. Shoulder-Girdle Vertebrata 66In all the known Urodela the endosteal deposits are entirely ruled by the much earlier and more potent *ectosteal sheath.
1870 W. H. Flower Introd. Osteol. Mamm. vii. 74They ossify, according to Parker, *ectosteally, or from without inwards.
1860 Mayne Exp.Lex. ,*Ectozoon, a general term for those parasitic insects..that infest the surface, or external part of the body, in distinction from the Entozoa.
ecto-
word-forming element generally meaning "outside, external," before vowels ect-, comb. form of Greek adverb ektos "outside, out of; free from; exempt" (opposed to entos), used to form compounds in Greek (such as ektome "a cutting out"); related to Greek ek, ex "out," from PIE *eghs "out" (see ex-).
ecto-
outside, external:
outside, external:
ectomorph, ectoderm, ectoplasm
ORIGIN: Repr. Greek ekto- stem of ektos adverb: see -o-
ecto-
combining form. to or on the outside: Ectoderm = the outer cellular layer of an embryo.
[< Greek ekto- < ektós out of]
ecto-
combining form
see ect-
see ect-
ecto-
Prefix
- outside
Etymology
From the Ancient Greek ἐκτός (ektós, “outside”).