/ Dictionary / Index N nitro: Meaning and Definition of Find definitions for: ni•tro Pronunciation: (nī'trō), [key] — adj. containing the nitro group. —n. nitroglycerin. nitro- Pronunciation: [key] a combining form used in the names of chemical compounds in which the nitro group is present: nitroglycerin. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. nitrite nitrobacteria Related Content Daily Word Quiz: abdicate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language