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[me-thahy-uh-neen, -nin] /mɛˈθaɪ əˌnin, -nɪn/
noun, Biochemistry
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. Symbol: M.
Abbreviation: Met;
1925-30; blend of methyl and thionine Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for methionine
  • Methyl mercaptan is also used to make methionine, an amino acid which may be deficient in the diet.
British Dictionary definitions for methionine


/mɛˈθaɪəˌniːn; -ˌnaɪn/
an essential amino acid containing sulphur, which occurs in many proteins: important in methylating reactions
Word Origin
C20: meth- + thionine
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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methionine in Medicine

methionine me·thi·o·nine (mə-thī'ə-nēn')
Abbr. Met
A sulfur-containing essential amino acid obtained from various proteins or prepared synthetically and used as a dietary supplement and in pharmaceuticals.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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methionine in Science
An essential amino acid. Chemical formula: C5H11NO2S. See more at amino acid.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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