/ Dictionary / Index N nitrogen-fixing: Meaning and Definition of Find definitions for: ni•tro•gen-fix•ing Pronunciation: (nī'tru-jun-fik"sing), [key] — adj. involved in or aiding the process of nitrogen fixation. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: nitrogen-fixing (Thesaurus) nitrogen fixer nitrogenize Related Content Daily Word Quiz: resilient Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language