fibroin

[ fahy-broh-in ]
/ ˈfaɪ broʊ ɪn /

noun Biochemistry.

an indigestible protein that is a principal component of spider webs and silk.

Origin of fibroin

1860–65; < French fibroïne; see fibro-, -in2
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for fibroin

fibroin

/ (ˈfaɪbrəʊɪn) /

noun

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