Definition of D
1. Noun. A fat-soluble vitamin that prevents rickets.
2. Adjective. Denoting a quantity consisting of 500 items or units.
3. Noun. The cardinal number that is the product of one hundred and five.
4. Noun. The 4th letter of the Roman alphabet.
Medical Definition of D
1.
1. Symbol for Diopter; for dexter (right), the vitamin D potency of cod liver oil, multiples of which (5D, 100D, etc.) are used to designate the vitamin D potency of irradiated ergosterol (viosterol) or other substances; for deuterium; for dihydrouridine in nucleic acids; for diffusing capacity; for aspartic acid; dihydrouridine; diffusion coefficient (in italics).
2. Denotes a double bond, usually with a superscript to indicate position in a chain (d5); application of heat in a reaction (A B); absence of heat treatment (); distance between two atoms in a molecule; or position of a substituent located on the fourth atom from the carboxyl or other primary functional group (d); change (d); thickness (d); chemical shift in NMR (d).
3. Prefix indicating a chemical compound to be dextrorotatory; should be avoided when (+) or (-) could be used.
(21 Jun 2000)
Lexicographical Neighbors of D
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