Dictionary

cysteine

noun cys·te·ine \ˈsis-tə-ˌēn\

Definition of CYSTEINE

:  a crystalline sulfur-containing amino acid C3H7NO2S readily oxidizable to cystine

Origin of CYSTEINE

International Scientific Vocabulary, from cystine + -ein
First Known Use: 1884

cysteine

noun cys·teine \ˈsis-tə-ˌēn\   (Medical Dictionary)

Medical Definition of CYSTEINE

:  a sulfur-containing amino acid C3H7NO2S occurring in many proteins and glutathione and readily oxidizable to cystine—abbreviation Cys

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