FIBROIN Meaning of FIBROIN in English /fuy"broh in/ , n. Biochem.an indigestible protein that is a principal component of spider webs and silk. [ 1860-65; fibroïne; see FIBRO-, -IN 2 ] Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012