methionine

[ me-thahy-uh-neen, -nin ]

noun

, Biochemistry.

1. 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. : Met; : M

methionine

/ mɛˈθaɪəˌniːn; -ˌnaɪn /

noun

1. an essential amino acid containing sulphur, which occurs in many proteins: important in methylating reactions

methionine

/ mə-thī′ə-nēn′ /

1. An essential amino acid. Chemical formula: C 5 H 11 NO 2 S.
2. See more at amino acid

Word History and Origins

Origin of methionine¹

First recorded in 1925–30; blend of methyl and thionine ( def )

Word History and Origins

Origin of methionine¹

C20: meth- + thionine