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cysteine.

A sulphur-containing nonessential amino acid C₃H₇NO₂S found in most animal proteins; it readily oxidizes to cystine.

8 characters2 syllables approx.English language

Meaning & usage

noun/ˈsɪs.təˌiːn/Received-Pronunciation/ˈsɪs.tə.ɪn/Received-Pronunciation/ˈsɪs.tiˌiːn/Received-Pronunciation/ˈsɪs.ti.ɪn/Received-Pronunciation
  1. A sulphur-containing nonessential amino acid C₃H₇NO₂S found in most animal proteins; it readily oxidizes to cystine.

    countable · uncountable
Where this word comes from

An alteration of cystine, see -eine.

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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.