D Definition
dē
noun
The fourth letter of the English alphabet: from the Greek delta, a borrowing from the Phoenician.
Webster's New World
Any of the speech sounds that this letter represents, as, in English, the (d) of dog.
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A type or impression for d or D.
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The fourth in a sequence or group.
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A Roman numeral for 500; with a superior bar (), 500,000 or, less often, 5,000
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abbreviation
Differential.
American Heritage
Down quark.
American Heritage
Day(s)
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Dative.
American Heritage
Dead.
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adjective
Of d or D.
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Fourth in a sequence or group.
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Shaped like D.
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Below average in quality.
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Synonyms:
affix
Dextrorotatory.
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Having an asymmetrical, right-handed spatial arrangement of atoms: usually printed as a small capital.
D-glucose.
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Do.
D'you know the story?
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Had.
I'd seen it before.
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Would or should.
We said we'd help.
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other
In biochemistry, a symbol used as a prefix to indicate the spatial configuration of certain organic compounds with asymmetric carbon atoms. It is used if an organic compound has a configuration about an asymmetric carbon atom analogous to that of D-glyceraldehyde (the arbitrarily chosen standard), in which the hydroxy (OH) functional group is on the right side of the asymmetric carbon atom in a Fischer projection formula.
American Heritage Medicine
Origin of D
From dextrorotatory
From American Heritage Dictionary of the English Language, 5th Edition
