ˈtīrəsə̇ˌnās, ˈtir-, -āz noun
( -s )
Etymology: International Scientific Vocabulary tyrosine + -ase
: a copper-containing enzyme that promotes the reaction of oxygen and tyrosine or other phenols (as para -cresol) giving rise to a series of oxidation products including an ortho diphenol, an orthoquinone, and a melanin and that is widely distributed in plants and animals — compare polyphenol oxidase