tyrosine noun. ['tʌɪrǝsi:n] M19.
[Irreg. from Greek turos cheese + -INE⁵.]
Chemistry. A hydrophilic amino acid widely present in proteins and a metabolic precursor of several important substances, including adrenalin, thyroxine, and melanin; 3-(p-hydroxyphenyl)alanine, C₆H₄(OH)CH₂CH(NH₂)COOH.

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