/ Dictionary / Index T tyrosinase: Meaning and Definition of Find definitions for: ty•ro•si•nase Pronunciation: (tī'rō-si-nās", -nāz", tir'ō-), [key] — n. Biochem. an oxidizing enzyme, occurring in plant and animal tissues, that catalyzes the aerobic oxidation of tyrosine into melanin and other pigments. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Tyrone tyrosine Related Content Daily Word Quiz: longevity Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language