Definition of keratin in English:


Line breaks: kera|tin
Pronunciation: /ˈkɛrətɪn


[mass noun]
A fibrous protein forming the main structural constituent of hair, feathers, hoofs, claws, horns, etc.
More example sentences
  • Cells are laced with a network of fibres more rigid than the rope-like structural proteins collagen and keratin.
  • Amino acids are absorbed by the body to help build keratin, the main protein in hair.
  • Cat claws are made of keratin, a protein also found in human nails.


mid 19th century: from Greek keras, kerat- 'horn' + -in1.

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