tyrosine

American  

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

noun

Biochemistry.

1. 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

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tyrosine British  

/ ˈtaɪrəˌsiːn, -sɪn, ˈtɪrə- /

noun

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

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tyrosine Scientific  

/ tī′rə-sēn′ /

1. A nonessential amino acid. Chemical formula: C ₉ H ₁₁ NO ₃ .

2. See more at amino acid

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Etymology

Origin of tyrosine

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

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Example Sentences

See Examples For:

tyrosine

The results therefore do not show that taking a tyrosine supplement shortens lifespan.

From Science Daily ● Sep. 6, 2026

The team also found that men generally have higher levels of tyrosine than women.

From Science Daily ● Sep. 6, 2026

Importantly, the researchers did not directly test tyrosine supplements.

From Science Daily ● Sep. 6, 2026

Despite these important roles, scientists still do not fully understand how long-term differences in phenylalanine and tyrosine levels might influence aging.

From Science Daily ● Sep. 6, 2026

Both the tyrosine and tryptophane may be either in the free state or in combination as polypeptid or peptone.

From The Elements of Bacteriological Technique A Laboratory Guide for Medical, Dental, and Technical Students. Second Edition Rewritten and Enlarged. by J. W. H. (John William Henry) Eyre

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