/ Dictionary / Index V vitamin: Meaning and Definition of Find definitions for: vi•ta•min Pronunciation: (vī'tu-minBrit.also vit'u-min), [key] — n. any of a group of organic substances essential in small quantities to normal metabolism, found in minute amounts in natural foodstuffs or sometimes produced synthetically: deficiencies of vitamins produce specific disorders. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: vitamin (Thesaurus) vital statistics vitamin A Related Content Daily Word Quiz: panacea Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language