Dictionary

keratin

noun ker·a·tin \ˈker-ə-tən\

Definition of KERATIN

:  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

Origin of KERATIN

International Scientific Vocabulary
First Known Use: circa 1849

Other Biochemistry Terms

bile, biodegradable, capsaicin, metabolism

keratin

noun ker·a·tin \ˈker-ət-ən\   (Medical Dictionary)

Medical Definition of KERATIN

:  any of various sulfur-containing fibrous proteins that form the chemical basis of horny epidermal tissues (as hair and nails) and are typically not digested by enzymes of the gastrointestinal tract—see pseudokeratin

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