/ Dictionary / Index N NADH: Meaning and Definition of Find definitions for: NADH Pronunciation: [key] — Biochem. Biochem. an abbreviation for the reduced form of NAD in electron transport reactions. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Nader Nadine Related Content Daily Word Quiz: banshee Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language