keratinEnglishOxford New American Dictionarykeratin /ˈkerədən, ˈkɛrədən / ▸ noun a fibrous protein forming the main structural constituent of hair, feathers, hoofs, claws, horns, etc. – ORIGIN mid 19th century : from Greek keras, kerat- ‘horn’ + -in1.
EnglishOxford New American DictionaryEnglishOxford New American Dictionary
