/ Dictionary / Index N nitro group: Meaning and Definition of Find definitions for: ni'tro group" Pronunciation: [key] — Chem. Chem. the univalent group –NO. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. nitroglycerin nitrohydrochloric acid Related Content Daily Word Quiz: tactful Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language