/ Dictionary / Index N nitrobacteria: Meaning and Definition of Find definitions for: ni•tro•bac•te•ri•a Pronunciation: (nī"trō-bak-tēr'ē-u), [key] — sing. -te•ri•um certain bacteria in the soil involved in nitrifying processes. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: nitrobacteria (Thesaurus) nitro nitrobenzene Related Content Daily Word Quiz: belligerent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language