/ Dictionary / Index N nonnitrogenous: Meaning and Definition of Find definitions for: non•ni•trog•e•nous Pronunciation: (non"nī-troj'u-nus), [key] — adj. containing no nitrogen. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. nonnegative nonnuclear Related Content Daily Word Quiz: abominable Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language