di-


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di- 1

pref.
1. Two; twice; double: dichromatic.
2. Containing two atoms, radicals, or groups: dichloride.

[Greek; see dwo- in Indo-European roots.]

di- 2

pref.
Variant of dia-.

di-

prefix
1. twice; two; double: dicotyledon.
2. (Chemistry)
a. containing two specified atoms or groups of atoms: dimethyl ether; carbon dioxide.
b. a nontechnical equivalent of bi-15c
[via Latin from Greek, from dis twice, double, related to duo two. Compare bi-1]

di-

combining form
variant of dia-: diopter.

DI

drill instructor.

Di


Chem. Symbol.
didymium.

di-1

,
a combining form meaning “two,” “double”: diamide; dicotyledon; dihedron. Compare dis- 2.
[< Greek, comb. form representing dís twice, double, akin to dýo two. compare bi-1, twi-]

di-2

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

di-3

,
var. of dia- before a vowel: diorama.

di.

diameter.

di-

A prefix that means "two," "twice," or "double." It is used commonly in chemistry, as in dioxide, a compound having two oxygen atoms.
References in classic literature ?
The volleys di- rected against them had had a seeming windlike effect.
His establishment, for instance, was near the harbour, and whenever a sailorman came in for a hair-cut or a shave--if it was a strange face he couldn't help thinking di- rectly, "Suppose he's the son of old Hagberd
We have lost the first of the ebb," said the Di- rector, suddenly.