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词汇 di-
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di- 1
pref.（前缀）
  1. Two; twice; double:
    两个（的）；两次（的）；双的：
    dichromatic.
    二色性的
  2. Containing two atoms, radicals, or groups:
    两个原子的二基的或两族元素的：
    dichloride.
    二氯化物

语源
  1. Greek * see dwo-
    希腊语 *参见 dwo-
di- 2
pref.（前缀）
  1. Variant of dia-
    dia-的变体

di-1

prefix

twice; two; double
⇒ dicotyledon
containing two specified atoms or groups of atoms
⇒ dimethyl ether
⇒ carbon dioxide
a nontechnical equivalent of bi-1 (sense 5c)

Origin

via Latin from Greek, from dis twice, double, related to duo two. Compare bi-1

di-2

combining form

variant of dia- ⇒ diopter

dia- or di-

prefix

through, throughout, or during
⇒ diachronic
across
⇒ diactinic
apart
⇒ diacritic
(in botany) at right angles
⇒ diatropism
in opposite or different directions
⇒ diamagnetism

Origin

from Greek dia through, between, across, by

di-1

Word Origin
1
a prefix occurring in loanwords from Greek, where it meant “two,” “twice,” “double” (diphthong); on this model, freely used in the formation of compound words (dicotyledon; dipolar) and in chemical terms (diatomic; disulfide).
Also, dis-2.
Compare mono-.
Origin
Middle English ≪ Latin < Greek, combining form representing dís twice, double, akin to dýo two. See bi-1, twi-

di-2

1
variant of dis-1. before b, d, l, m, n, r, s, v, and sometimes g and j: digest; divide.

di-3

1
variant of dia- before a vowel:
diorama.
di-I.
a prefix of Greek origin, meaning 'twice', 'doubly', 'two', freely used (like bi-) as an English formative, as in dicotyledon, dipolar, and in many chemical terms, as diatomic, disulphide.
Compare mono-. Also, dis-. [Greek, representing dis twice, doubly. Compare bi-]
II.
variant of dis-1, before b, d, l, m, n, r, s, and v, and sometimes g and j, as in divide.
III.
variant of dia-, before vowels, as in dioptase, diorama.
di-
combining form
 ETYMOLOGY  Latin, from Greek; akin to Old English twi-
1. twice : twofold : double
    dichromatic
2. containing two atoms, radicals, or groups
    dioxide
di-1
/daɪ/  
combining form
twice; two-; double
表示“二次”, “二”, “双”, “二倍”, “二重”：

dichromatic.

■  Chemistry containing two atoms, molecules, or groups of a specified kind
【化】表示“包含两个原子（或分子）的”, “包含两个族（或基团）的”：

dioxide.

词源
from Greek dis 'twice'.
di-3
/daɪ/  
prefix
variant spelling of DIA- shortened before a vowel (as in dielectric).
同DIA-（a在元音前省略, 如dielectric）。
di-2
/dɪ/  
prefix
variant spelling of DIS- shortened before l, m, n, r, s (followed by a consonant), and v; also often shortened before g, and sometimes before j.
同DIS-（当l, m, n, r, s后面为辅音时, s在l, m, n, r, s前省略; s在v前省略; 另s在g前常常省略, 在j前有时省略）。
词源
from Latin.
▪ I.di-, prefix1|dɪ, daɪ|repr. L. dī-, reduced form of dis-, used in L. before the consonants b, d, g (usually), l, m, n, r, s + cons., v, and sometimes before j, as in dī-būcināre, dī-dūcĕre, dī-gestio, dī-gressio, dī-jūdicāre, dī-jungĕre and dis-jungĕre, dī-lātāre, dī-minuĕre, dī-missio, dī-numerāre, dī-rectus, dī-ruptio, dī-spersus, dī-stinguĕre, dī-strictus, dī-vertĕre. Often changed back in late L. and Romanic popular words to the full form dis-, whence dismiss, disrupt; but in mod. Eng. generally di-. In OF. and ME. often varying with de-, whence defer, demission n.2, devise, from L. differre, dīmissio, dīvīsa. This took place especially before a radical beginning with s + cons., where di- was phonetically identified with dis-, and shared in the alternation of dis-:—des- (de- 6, des-, dis-). Thus in ME. desperse, destinct, destill, destrain, destress for dis-; and per contra dispair, dispise, dispite, dispoil, distroy for de-. For its force in composition, see dis-: it is not, like the latter, a living prefix. The historical pronunciation in an unstressed syllable is |dɪ-|; cf. divide, diversion, diminish; but in cases where there is a parallel word in de-, as delate, dilate, it is usually pronounced |daɪ-| for the sake of distinction, and the present tendency is to extend |daɪ-| to other words, as digest, dilute, diluvium, diradiation, direct, diverge, diverse, divest. This seems due partly to analysis of the compound, partly to the influence of stressed forms as ˈdigest n. ˈdivers, in which the i is long and diphthongal.▪ II.di-, prefix2|daɪ, dɪ|repr. Gr. δι- for δίς twice, as in δίγαµος twice married, δίγλωττος double-tongued, bilingual, δίδραχµος worth two drachmas, δίπτυχος double-folded. Hence:1. Entering into numerous Eng. words, mostly technical, as dichromic, dicotyledon, digamma, digamy, diglot, digraph, dilemma, diphthong, diptych, distich, disyllable; also in the nomenclature of Natural History as Diadelphia, Diandria, Didelphia, Diptera: which see in their alphabetical places. So in Crystallography, as in di-tetrahedron a crystal having twice four sides or planes; so di-hexahedron, etc.2. As a living prefix, used in Chemistry, with the names of compounds and derivatives, in the general sense ‘twice, double’, but with various special applications. a. With the names of classes of compounds, as bromide, oxide, sulphide, cyanide, acetate, chlorate, nitrate, sulphate, amide, amine, etc., expressing the presence of two atoms or combining equivalents of the element or radical, as carbon dioxide CO2, manganese dichloride Mn Cl2.⁋In the earlier part of the 19th c. the use was different: the Latin prefix bi- was then used, where di- is now, to express two proportions of the chlorous constituent, as in bi-chloride of mercury = corrosive sublimate; while the Greek di- was used to express two proportions of the basic constituent; thus calomel, when supposed to contain two of mercury to one of chlorine, was called a di-chloride.b. With the names of specific compounds (chiefly organic), indicating a body having twice the formula of a given compound; used chiefly with the names of hypothetical radicals, to indicate the free state of these (supposed to be that of a double molecule), as in di-allyl, dibenzyl, dicyanogen.In diphenol, the use is less exact, since this substance has not exactly the constitution of two molecules of phenol.c. With the name (or combining form of the name) of an element or radical, expressing the presence of two atoms or molecules of that body, as in di-hydr(o)-, di-oxy-, di-carbon-, di-carb(o)-, di-nitr(o)-, di-az(o)-, di-chlor(o)-, di-brom(o)-, di-iod(o)-, di-sulph(o)-, di-phosph(o)-, di-bor(o)-, di-arsen(o)-, di-ammoni(o)-, di-amm(o)-, di-amid(o)-, di-cyan(o)-, di-methyl-, di-ethyl-, di-propyl-, di-amyl-, di-allyl-. Used especially in organic chemistry, to indicate that two atoms or molecules of the body take the place of two atoms of hydrogen, as in dibromomethane, dichlorobenzene.d. These formations (c) are sometimes used attributively or adjectively as separate words, as di-azo compounds, di-carbon series, di-phenyl group. So with other adjectives, as diacid, dihydric, diphenic.e. On the preceding classes of words derivatives are formed, as diazotize, diazotype, dichromated.▪ III.di-, prefix3the form of dia- used before a vowel, as in di-acoustic, di-æresis, di-esis, di-ocese, di-optric, di-orama.
di-
1
word-forming element meaning "two, double, twice," from Greek di-, from dis "twice," related to duo (see two).
2
word-forming element meaning "apart, asunder," form of dis- before certain voiced consonants.
3
word-forming element meaning "through; thoroughly," form of dia- before vowels.
☞ di-, dy-
1. prefix1 | 2. prefix2 | 3. prefix3
 1 
di- /dɪ, dʌɪ/ prefix1 (not productive).Repr. Latin di- the reduced form of dis- dis- used before b, d, g (usually), j (sometimes), l, m, n, r, s + consonant, and v. In late Latin di- was sometimes changed back to the full form dis-: hence dismiss, disrupt.
 2 
di- /dʌɪ, dɪ/ prefix2.
ORIGIN: Greek, from dis (adverb) twice.
Used (a) in words of Greek origin or in English formations modelled on them, with the sense ‘twice, doubly’, as dilemma, diphthong, dicotyledon; (b) as a productive suffix used in chemical names to indicate the presence of two atoms of an element or two similar radicals, as dioxide, dichromate, sometimes replacing two atoms of hydrogen, as dinitrobenzene.
 3 
di- /dʌɪ/ prefix3.The form of dia-1 used before a vowel or (sometimes) h.
☞ di
di-
combining form
Etymology: Middle English, from Middle French, from Latin, from Greek; akin to Old English twi- — more at twi-
1. : twice : twofold : double
 < dichromatic >
2. : containing two atoms, radicals, or groups (of a specified kind)
 < dichloride >
3. : being a Greek coin or unit of value worth two specified units
 < distater >
 < didrachma >

di- 1

Prefix

  1. Meaning two, twice, or double.
    dioxide
  2. An occasionally used form of dis-.

Etymology

From Ancient Greek δίς (dís, “twice”).

Related terms

English words prefixed with di-


See also

  • duo-
  • bi-
  • bis- (chemistry)
  • dwi-
  • twi-

    • di- 2

    Prefix

    1. A form of dia- before a vowel.
      diactinic
      dielectric

    Etymology

    From Ancient Greek δία (día, “through”).

    前缀：di-

    ① 表示"两个，双"

    dichromatic 两色的（di+chrom颜色+atic→两色的）

    dioxide 二氧化物（di+ox氧＋ide→二氧化物）

    dilemma 进退两难（di+lemma争论→二种争论→进退两难）

    dichotomize 分成二，对分（dicho=di+tom切割+ize→切成二分）

    ② 表示"使…变成，分开，离开"

    dilate 膨胀，扩大（di+late放→分开放→扩大）

    dilute 冲淡，稀释(di+lute冲洗→冲洗开→冲淡)

    digest 消化；文摘（di+gest带→带下去→消化→经过消化后的精华→文摘）

    diminish 减少；消失（di+mini小+ish→变小，减少）

    digress 离题（di+gress走→走开→离题）

    divide 分开（di+vide分开→分开）

    divorce 离婚（di+vorce=vert转→从〔丈夫身边〕转开→离婚；参考：divert转开）

    前缀：di- 二, 双

    diatomic 二原子的

    dichromatic 两色的

    disyllable 双音节词

    dioxide 二氧化物

    ditheism 二神论

    diacid 二酸

    digamy 二婚，再婚

    diarchy 双头政治

    前缀：di-

    【词根含义】：通过,横过;分离,分开;二,双

    【词根来源】：来源于拉丁语前缀di-。

    【同源单词】：antediluvian, digest, digestion, digestive, digress
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    更新时间：2025/1/10 9:22:37