/ Dictionary / Index N nicotinamide adenine dinucleotide: Meaning and Definition of Find definitions for: nicotin'amide ad'enine dinu'cleotide Pronunciation: [key] — Biochem. Biochem. See NAD Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. nicotinamide nicotinamide adenine dinucleotide phosphate 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