di-(redirected from Numerical prefix)
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1. Two; twice; double: dichromatic.
2. Containing two atoms, radicals, or groups: dichloride.
Variant of dia-.
1. twice; two; double: dicotyledon.
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]
variant of dia-: diopter.
a combining form meaning “two,” “double”: diamide; dicotyledon; dihedron. Compare dis- 2.
var. of dis- 1 before b, d, l, m, n, r, s, v, and sometimes g and j: digest; divide.
var. of dia- before a vowel: diorama.
A prefix that means "two," "twice," or "double." It is used commonly in chemistry, as in dioxide, a compound having two oxygen atoms.