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keratinOne entry found. Main Entry: ker·a·tin Pronunciation: \ˈker-ə-tən\ Function: noun Etymology: International Scientific Vocabulary Date: circa 1849 : any of various sulfur-containing fibrous proteins that form the chemical basis of horny epidermal tissues (as hair and nails) — ke·ra·ti·nous \kə-ˈra-tə-nəs\ adjective 
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