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fibroin

[fahy-broh-in] /ˈfaɪ broʊ ɪn/
noun, Biochemistry
1.
an indigestible protein that is a principal component of spider webs and silk.
Origin
1860-1865
1860-65; < French fibroïne; see fibro-, -in2
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for fibroin

fibroin

/ˈfaɪbrəʊɪn/
noun
1.
a tough elastic protein that is the principal component of spiders' webs and raw silk
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
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12
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