/ Dictionary / Index N nicotinic acid: Meaning and Definition of Find definitions for: nic'otin'ic ac'id Pronunciation: [key] — Biochem. Biochem. a crystalline acid, CHNO, that is a component of the vitamin-B complex, found in fresh meat, yeast, etc., produced by the oxidation of nicotine, and used in the prevention and treatment of pellagra. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. nicotinic nicotinism Related Content Daily Word Quiz: belligerent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language