/ Dictionary / Index N nitrous bacteria: Meaning and Definition of Find definitions for: ni'trous bacte'ria Pronunciation: [key] nitrobacteria that convert ammonia derivatives into nitrites by oxidation. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. nitrous acid nitrous ether Related Content Daily Word Quiz: clairvoyant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language