Definitions for fibroinˈfaɪ broʊ ɪn
Random House Webster's College Dictionary
fi•bro•inˈfaɪ broʊ ɪn(n.)
an indigestible protein that is a principal component of spider webs and silk.
Origin of fibroin:
1860–65; < F
A type of protein created by silkworms in the production of silk.
a variety of gelatin; the chief ingredient of raw silk, extracted as a white amorphous mass