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Syllabification: ker·a·tin
Pronunciation: /ˈkerədən

Definition of keratin in English:


A fibrous protein forming the main structural constituent of hair, feathers, hoofs, claws, horns, etc.
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.



Pronunciation: /kəˈratn-əs/
Example sentences
  • The origin of this reflection, which is the fingerprint on the diffraction pattern of the coiled coil structure in keratinous tissues, was unclear until this recent study.
  • We report a case of an unusual inflammatory reaction and multiple keratinous nodules in a thyroglossal cyst.
  • The invention also concerns methods and devices for bleaching and permanent waving of keratinous fibres using said composition.

Definition of keratin in:

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