cystine cystignathine • cystinuria · · · Info · Definitions · Characters · · cystine · · Text Latin · · Script 7 · · Length 2 · · Syllables Definitions · · · (noun) a crystalline amino acid found in proteins (especially keratin); discovered in bladder stones. · · Noun Definition 1 Characters · · c latin small letter c U+0063 e latin small letter e U+0065 i latin small letter i U+0069 n latin small letter n U+006E s latin small letter s U+0073 t latin small letter t U+0074 y latin small letter y U+0079