tyro sine

tyrosine

[tahy-ruh-seen, -sin, tir-uh-]
noun Biochemistry.
a crystalline amino acid, HOC 6 H 4 CH 2 CH(NH 2 )COOH, abundant in ripe cheese, that acts as a precursor of norepinephrine and dopamine. Abbreviation: Tyr; Symbol: Y

Origin:
1855–60; < Greek tȳrós cheese + -ine2

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World English Dictionary
tyrosine (ˈtaɪrəˌsiːn, -sɪn, ˈtɪrə-)
 
n
an aromatic nonessential amino acid; a component of proteins. It is a metabolic precursor of thyroxine, the pigment melanin, and other biologically important compounds
 
[C19: from Greek turos cheese + -ine²]

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Etymonline
Word Origin & History

tyrosine
amino acid, 1857, coined 1846 by Ger. chemist Baron von Justus Liebig (1802-73) from Gk. tyros "cheese" + chemical suffix -ine. So called because it was easily obtained from cheese.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

tyrosine ty·ro·sine (tī'rə-sēn')
n.
Abbr. Tyr
A white crystalline amino acid that is derived from the hydrolysis of proteins such as casein and is a precursor of epinephrine, thyroxine, and melanin.

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American Heritage
Science Dictionary
tyrosine   (tī'rə-sēn')  Pronunciation Key 
A nonessential amino acid. Chemical formula: C9H11NO3. See more at amino acid.
The American Heritage® Science Dictionary
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