from the GNU version of the Collaborative International Dictionary of English.
- noun (Chem.) An organic acid (C6H5NO2), a carboxylated derivative of pyridine, obtained by the oxidation of nicotine; called also
niacinand antipellagra vitamin, and vitamin B5. Chemically it is 3-pyridinecarboxylic acid.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun biochemistry
pyridine-3- carboxylic acid; together with nicotinamideis a part of the vitamin B complex.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun a B vitamin essential for the normal function of the nervous system and the gastrointestinal tract
from The American Heritage® Dictionary of the English Language, 4th Edition
[So called because it is often obtained by oxidizing nicotine.]
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