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tyrosine

American

[tahy-ruh-seen, -sin, tir-uh-] / ˈtaɪ rəˌsin, -sɪn, ˈtɪr ə- /

noun

Biochemistry.

a crystalline amino acid, HOC 6 H 4 CH 2 CH(NH2 )COOH, abundant in ripe cheese, that acts as a precursor of norepinephrine and dopamine. Tyr; Y

tyrosine British

/ -sɪn, ˈtɪrə-, ˈtaɪrəˌsiːn /

noun

an aromatic nonessential amino acid; a component of proteins. It is a metabolic precursor of thyroxine, the pigment melanin, and other biologically important compounds

"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

tyrosine Scientific

/ tī′rə-sēn′ /

A nonessential amino acid. Chemical formula: C ₉ H ₁₁ NO ₃ .
See more at amino acid

Etymology

Origin of tyrosine

1855–60; < Greek tȳrós cheese + -ine ²

Example Sentences

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See Examples For:

tyrosine

Scientists do not yet know exactly how tyrosine might influence lifespan, but several possibilities have emerged.

From Science Daily ● Jun. 15, 2026

The study found no significant association between tyrosine levels and lifespan among female participants.

From Science Daily ● Jun. 15, 2026

The findings suggested that higher tyrosine levels may contribute to reduced life expectancy in men.

From Science Daily ● Jun. 15, 2026

Because of these functions, tyrosine has attracted growing interest among researchers studying aging, brain health, and lifespan.

From Science Daily ● Jun. 15, 2026

It is caused by the action of nitric acid on tyrosine.

From The Chemistry of Plant Life by Thatcher, Roscoe Wilfred

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023