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