noun Etymology: from its discovery in bladder stones Date: 1843 a crystalline amino acid C 6 H 12 N 2 O 4 S 2 that is widespread in proteins (as keratins) and is a major metabolic sulfur source
CYSTINE
Meaning of CYSTINE in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012