ty·​ros·​i·​nase tə-ˈrä-sə-ˌnās How to pronounce tyrosinase (audio)
: a copper-containing enzyme that promotes the oxidation of phenols (such as tyrosine) and is widespread in plants and animals

Example Sentences

Recent Examples on the Web Besides melianin production, tyrosinase (and hence Tyrp1) is at a key step of catecholamine synthesis. Razib Khan, Discover Magazine, 3 Sep. 2011 Hydroxytyrosol and Vitamin C are antioxidants that lighten dark spots by directly and indirectly inhibiting tyrosinase activity which reduces the production of melanin. Emily Burns, ELLE, 6 Dec. 2022 Naturally, the less tyrosinase produced, the less melanin produced. Janell M. Hickman, SELF, 27 July 2022 On a biological level, hydroquinone works by inhibiting an enzyme called tyrosinase, which aids in the production of melanin, Dr. Cook-Bolden says. Janell M. Hickman, SELF, 27 July 2022 Boasting excellent anti-inflammatory and anti-aging properties, vitamin C is an antioxidant, and a tyrosinase inhibitor. Noel Cody, Essence, 1 July 2021 When incorporated into your complexion regimen properly, hydroquinone decreases the production of melanin by inhibiting tyrosinase, an enzyme needed for melanin production, to decrease the appearance of hyperpigmentation. Devon Abelman, Allure, 14 May 2021 Kojic acid, blocks tyrosinase, which is needed to produce melanin in the skin, therefore preventing pigment formation. Dori Price, Good Housekeeping, 23 Mar. 2021 Caviar Eye Extraordinaire is enriched with the breakthrough illuminating molecule Lumidose - the most potent inhibitor of tyrosinase, the enzyme responsible for the formation of melanin. Joseph Deacetis, Forbes, 1 Mar. 2021 See More

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'tyrosinase.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

Word History

First Known Use

1896, in the meaning defined above

Time Traveler
The first known use of tyrosinase was in 1896

Dictionary Entries Near tyrosinase

Cite this Entry

“Tyrosinase.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/tyrosinase. Accessed 7 Feb. 2023.

Medical Definition


ty·​ros·​i·​nase tə-ˈräs-ə-ˌnās, tī-, -ˌnāz How to pronounce tyrosinase (audio)
: an enzyme that promotes the oxidation of phenols (as tyrosine) and is widespread in plants and animals

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