[tahy-roh-si-neys, -neyz, tir-oh-]
noun Biochemistry.
  1. 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. 2018

British Dictionary definitions for tyrosinase


  1. 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