/ Dictionary / Index N nitrogenase: Meaning and Definition of Find definitions for: ni•trog•en•ase Pronunciation: (nī-troj'u-nās", -nāz", nī'tru-ju-), [key] — n. Biochem. an enzyme complex that catalyzes the reduction of molecular nitrogen in the nitrogen-fixation process of bacteria. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: nitrogenase (Thesaurus) nitrogen nitrogen balance Related Content Daily Word Quiz: eureka Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language