[tahy-roh-si-neys, -neyz, tir-oh-]

noun Biochemistry.

an oxidizing enzyme, occurring in plant and animal tissues, that catalyzes the aerobic oxidation of tyrosine into melanin and other pigments.

Origin of tyrosinase

First recorded in 1895–1900; tyrosine + -ase
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for tyrosinase



an enzyme occurring in many organisms that is a catalyst in the conversion of tyrosine to the pigment melanin; inactivity of this enzyme results in albinism
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012