/me thuy"euh neen', -nin/ , n. Biochem.
an amino acid, CH 3 SCH 2 CH 2 CH(NH 2 )COOH, found in casein, wool, and other proteins or prepared synthetically: used as a supplement to a special diet in the prevention and treatment of certain liver diseases. Abbr.: Met; Symbol: M
[ 1925-30; b. METHYL and THIONINE ]