/ Dictionary / Index C catalase: Meaning and Definition of Find definitions for: cat•a•lase Pronunciation: (kat'l-ās", -āz"), [key] — n. Biochem. an enzyme that decomposes hydrogen peroxide into oxygen and water. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: catalase (Thesaurus) Catalan catalectic Related Content Daily Word Quiz: gregarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language