fibroin
noun
fi·bro·in ˈfī-brə-wən 
ˈfi-,
-brō-ən
: an insoluble protein comprising the filaments of the raw silk fiber
Example Sentences
Recent Examples on the Web The most common types are soybean peptides, silk fibroin peptides, and rice peptides. 
Sarah Madaus, SELF, 27 July 2022 The formula features the brand's silk protein, which is a blend of sericin and fibroin. Sarah Han, Allure, 14 June 2022 This luxurious ingredient contains two proteins — sericin and fibroin — that can benefit skin health, according to Morgan Rabach, M.D., a clinical assistant professor of dermatology at Mount Sinai in New York City. Jennifer Hussein, Allure, 1 Mar. 2022 Three types of silk (fibroin, sericin, and silk powder) also blur enlarged pores and absorb excess oil, so skin doesn't appear overly shiny. Sarah Han, Allure, 16 Sep. 2021 Unlike black widows, Silkworms extrude only one type of fiber, made of a protein complex called silk fibroin. Max G. Levy, Wired, 28 June 2021 Controlling the way fibroin absorbs water vapor allows scientists to tweak its visual appearance. David Grossman, Popular Mechanics, 9 Oct. 2019 The material takes advantage of fibroin, a protein naturally present in silk that's produced by moths and other insects. David Grossman, Popular Mechanics, 9 Oct. 2019 The team combined a protein found in spider silk, called fibroin, with a form of plastic and a type of calcium that’s found in our bones. Angela Chen, The Verge, 4 May 2018 See More
Sarah Madaus, SELF, 27 July 2022 The formula features the brand's silk protein, which is a blend of sericin and fibroin. Sarah Han, Allure, 14 June 2022 This luxurious ingredient contains two proteins — sericin and fibroin — that can benefit skin health, according to Morgan Rabach, M.D., a clinical assistant professor of dermatology at Mount Sinai in New York City. Jennifer Hussein, Allure, 1 Mar. 2022 Three types of silk (fibroin, sericin, and silk powder) also blur enlarged pores and absorb excess oil, so skin doesn't appear overly shiny. Sarah Han, Allure, 16 Sep. 2021 Unlike black widows, Silkworms extrude only one type of fiber, made of a protein complex called silk fibroin. Max G. Levy, Wired, 28 June 2021 Controlling the way fibroin absorbs water vapor allows scientists to tweak its visual appearance. David Grossman, Popular Mechanics, 9 Oct. 2019 The material takes advantage of fibroin, a protein naturally present in silk that's produced by moths and other insects. David Grossman, Popular Mechanics, 9 Oct. 2019 The team combined a protein found in spider silk, called fibroin, with a form of plastic and a type of calcium that’s found in our bones. Angela Chen, The Verge, 4 May 2018 See More Word History
Etymology
French fibroïne, from fibr- + -ine -in
First Known Use
1878, in the meaning defined above