keratin


Concise Oxford English Dictionary © 2008 Oxford University Press:
keratin /ˈkɛrətɪn/
noun any of a group of fibrous proteins forming the main structural constituent of hair, nails, feathers, hoofs, claws, and horns.
– derivatives
keratinous adjective.
– origin C19: from Gk keras, kerat- ‘horn’ + -in1.
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