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-.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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.
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

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.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.

di-

A prefix that means "two," "twice," or "double." It is used commonly in chemistry, as in dioxide, a compound having two oxygen atoms.
The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
References in classic literature ?
The volleys di- rected against them had had a seeming windlike effect.