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cystine

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WordReference Random House Unabridged Dictionary of American English © 2026

cys•tine n. [Biochem.]

Biochemistrya crystalline amino acid, C₆H₁₂O₄N₂S₂, occurring in most proteins, esp. the keratins in hair, wool, and horn, and yielding cysteine on reduction.

1835–45; cyst- + -ine²; so called because found in the bladder

'cystine' also found in these entries (note: many are not synonyms or translations):

cysteine - cystinuria

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