/ Thesaurus / N Synonyms of nitrous bacterium Find synonyms for: Noun1. nitrite bacterium, nitrous bacterium, nitrobacteriumusage: any of the nitrobacteria that oxidize ammonia into nitritesWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: reticent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language