Definition of cystine in English:


Syllabification: cys·tine
Pronunciation: /ˈsisˌtēn


  • A compound that is an oxidized dimer of cysteine and is the form in which cysteine often occurs in organic tissue.
    • Chemical formula: C6H12N2O4S2
    More example sentences
    • The sulfur-containing amino acids are methionine, cysteine, cystine, homocysteine, homocystine, and taurine.
    • Cysteine in the extracellular space is mostly oxidized to cystine.
    • Glutathione conjugation uses Nacetylcysteine, cysteine, and methionine; cystine is used for sulfation; and glucuronidation requires pantothenic acid.


mid 19th century: from Greek kustis 'bladder' (because it was first isolated from urinary calculi) + -ine4.

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Pronunciation: skōSH
a small amount; a little