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keratin

Pronunciation: /ˈkɛrətɪn/
Definition of keratin

noun

[mass 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

keratin in other Oxford dictionaries

Definition of keratin in the US English dictionary