Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A white crystalline acid, C5H4NCOOH, that is a component of the vitamin B complex found in meat, wheat germ, dairy products, and yeast and is used to treat and prevent pellagra. Also called nicotinic acid.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A water-soluble vitamin, a component of vitamin B complex, found in meat, yeast, and dairy products; it is essential to metabolism.

from the GNU version of the Collaborative International Dictionary of English

  • n. A B vitamin (vitamin B5) essential for the normal function of the nervous system and the gastrointestinal tract. Called also nicotinic acid and antipellagra vitamin. Chemical formula C6H5NO2, chemically it is 3-pyridinecarboxylic acid.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a B vitamin essential for the normal function of the nervous system and the gastrointestinal tract

Etymologies

ni(cotinic) ac(id) + -in.
(American Heritage® Dictionary of the English Language, Fourth Edition)

Examples

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