• synonyms


noun Biochemistry.
  1. an indigestible protein that is a principal component of spider webs and silk.
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Origin of fibroin

1860–65; < French fibroïne; see fibro-, -in2
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for fibroin

Historical Examples

  • Fibroin: a chemical compound found in silk, cobwebs and the like.

    Explanation of Terms Used in Entomology

    John. B. Smith

British Dictionary definitions for fibroin


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