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cystine

[sis-teen, -tin] /ˈsɪs tin, -tɪn/
noun, Biochemistry
1.
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.
Origin
1835-1845
1835-45; cyst- + -ine2; so called because found in the bladder
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for cystine

cystine

/ˈsɪstiːn; -tɪn/
noun
1.
a sulphur-containing amino acid present in proteins: yields two molecules of cysteine on reduction. Formula: HOOCCH(NH2)CH2SSCH2CH(NH2)COOH
Word Origin
C19: see cysto- (bladder), -ine²; named from its being discovered in a type of urinary calculus
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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cystine in Medicine

cystine cys·tine (sĭs'tēn')
n.
A white crystalline amino acid that is found in many proteins, especially keratin, and is the major source of metabolic sulfur.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Encyclopedia Article for cystine

a crystalline, sulfur-containing amino acid that is formed from two molecules of the amino acid cysteine. Cystine can be converted to cysteine by reduction (in this case, the addition of hydrogen). Discovered in 1810, cystine was not recognized as a component of proteins until 1899, when it was isolated from animal horn. Cystine is particularly abundant in skeletal and connective tissues and in hair, horn, and wool.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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