/ Dictionary / Index P peroxidase: Meaning and Definition of Find definitions for: per•ox•i•dase Pronunciation: (pu-rok'si-dās", -dāz"), [key] — n. Biochem. any of a class of oxidoreductase enzymes that catalyze the oxidation of a compound by the decomposition of hydrogen peroxide or an organic peroxide. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: peroxidase (Thesaurus) perovskite peroxidate Related Content Daily Word Quiz: tactful Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language