/ Dictionary / Index O oxygenase: Meaning and Definition of Find definitions for: ox•y•gen•ase Pronunciation: (ok'si-ju-nās", -nāz"), [key] — n. Biochem. an oxidoreductase enzyme that catalyzes the introduction of molecular oxygen into an organic substance. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: oxygenase (Thesaurus) oxygen acid oxygenate Related Content Daily Word Quiz: clairvoyant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language