• (British) IPA: /mɪˈθʌɪəniːn/, /mɪˈθʌɪənɪn/
  • (America) IPA: /mɛˈθaɪəˌniːn/, /-ˌnaɪn/


  1. (amino acid, organic compound) A lipotropic, sulphur-containing essential amino acid, C5H11NO2S, found in most protein.
    • 1999, Matt Ridley, Genome, Harper Perennial 2004, p. 253:
      The purpose was to make soya beans more healthy for those for whom they are a staple food by correcting soya beans' natural deficiency in a chemical called methionine.
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