methionine.
A sulphur-containing amino acid, C₅H₁₁NO₂S, in L- and D-forms.
Meaning & usage
A sulphur-containing amino acid, C₅H₁₁NO₂S, in L- and D-forms.
A sulphur-containing amino acid, C₅H₁₁NO₂S, in L- and D-forms. 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.
Where this word comes from
Etymology tree Proto-Indo-European *médʰu Proto-Hellenic *métʰu Ancient Greek μέθυ (méthu) Proto-Indo-European *swel-der.? Ancient Greek ῡ̔́λη (hū́lē)der. German -yl German Methylbor. English methyl Proto-Indo-European *dʰewh₂-der.? Ancient Greek θέειον (théeion) Ancient Greek θεῖον (theîon)der. English thio- English -n- English -ine English methionine From methyl + thio- + -n- + -ine.
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.