Definition of keratin
: any of various sulfur-containing fibrous proteins that form the chemical basis of horny epidermal tissues (such as hair and nails)
keratinousplay \kə-ˈra-tə-nəs\ adjective
Recent Examples of keratin from the Web
Polyvinyl pyrrolidone sticks to the keratin in hair shafts and, like isopentane, makes the hairs stand up straight for a clean shave.
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Origin and Etymology of keratin
International Scientific Vocabulary
First Known Use: circa 1849
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