from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A white crystalline amino acid, C6H12N2O4S2, formed from the disulfide linkage of two cysteines during folding of many proteins, especially keratin, and stabilizing the tertiary structure of the protein.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. a nonessential amino acid formed by the oxidation of cysteine; it contains two cycteine residues linked by a disulfide bond
from the GNU version of the Collaborative International Dictionary of English
- n. A white crystalline substance, C3H7NSO2, containing sulphur, occuring as a constituent of certain rare urinary calculi, and occasionally found as a sediment in urine.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a crystalline amino acid found in proteins (especially keratin); discovered in bladder stones
From its discovery in bladder stones.(American Heritage® Dictionary of the English Language, Fourth Edition)
From Ancient Greek κύστις ("bladder"), where it was found. (Wiktionary)