/ Dictionary / Index R reductase: Meaning and Definition of Find definitions for: re•duc•tase Pronunciation: (ri-duk'tās, -tāz), [key] — n. Biochem. any enzyme acting as a reducing agent. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: reductase (Thesaurus) reduct reductase test 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