cystine

American

[sis-teen, -tin] / ˈsɪs tin, -tɪn /

noun

Biochemistry.

a crystalline amino acid, C 6 H 12 O 4 N 2 S 2 , occurring in most proteins, especially the keratins in hair, wool, and horn, and yielding cysteine on reduction.

cystine British

/ ˈsɪstiːn, -tɪn /

noun

a sulphur-containing amino acid present in proteins: yields two molecules of cysteine on reduction. Formula: HOOCCH(NH 2 )CH 2 SSCH 2 CH(NH 2 )COOH

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of cystine

1835–45; cyst- + -ine ²; so called because found in the bladder

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cysteine vs. cystine

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023