''methionine'' ▫ᴱᴺ Entries

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''methionine'' ▫ᴱᴺ｜Definition｜1st｜20260331180822-00-⌔

methionine - Wiktionary, the free dictionary

English

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Noun

methionine (countable and uncountable, plural methionines)

• (biochemistry, organic chemistry) A sulphur - containing amino acid, C${}_5$ H${}_{11}$ NO${}_2$ S, in L- and D-forms.
  • (biochemistry, organic chemistry) The L-form thereof, a lipotropic molecule widely occurring in living organisms and found in most protein; in humans it is an essential amino acid.
    • ✤ Alternative forms: Met, M (IUPAC symbols)
    • ✤ 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.¹

Etymology

From methyl + thio- + -n- + -ine.

Pronunciation

• (UK) IPA: /mɪˈθʌɪəniːn/, /mɪˈθʌɪənɪn/
• Audio (Southern England): 🔊
• Audio (Southern England): 🔊
• (US) IPA: /mɛˈθaɪəˌniːn/, /-ˌnaɪn/

Printed 2026-06-28.

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Footnotes

1. 1999, Matt Ridley, Genome, Harper Perennial, published 2004, page 253: ↩

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