Di definition

Diameter.
abbreviation
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Twice, double, twofold.

Dichroism, dicotyledon.

affix
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(chem.) Having two atoms, molecules, radicals, etc.

Diacid.

affix
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Donor insemination.
abbreviation
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Diagnostic imaging.
abbreviation
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Two; twice; double.

Dichromatic.

prefix
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Containing two atoms, radicals, or groups.

Dichloride.

prefix
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Didymium.
symbol
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Drill instructor.
abbreviation
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affix
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affix
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Donor insemination.
abbreviation
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Diagnostic imaging.
abbreviation
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1
A prefix that means “two,” “twice,” or “double.” It is used commonly in chemistry, as in dioxide, a compound having two oxygen atoms.
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Plural form of deus.
noun
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Di is defined as an abbreviation for drill instructor or diameter, or the symbol for didymium.

An example of di is the officer that teaches new soldiers about the military.

An example of di is the length of a line down the center of a circle.

An example of di is the symbol for a metallic mixture.

abbreviation
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Drill instructor.
abbreviation
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1

Other Word Forms

Noun

Singular:
di
Plural:
dis

Origin of di

  • Gr di- < dis-, twice < IE *dwis (> L bis, MHG zwis) < base *dwo, two

    From Webster's New World College Dictionary, 5th Edition

  • Greek dwo- in Indo-European roots

    From American Heritage Dictionary of the English Language, 5th Edition