Definition of keratin in English:
- 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.
rhinoceros from Late Middle English:
It is the look of the rhinoceros that provides its name, which comes from Greek rhino- ‘nose’ and keras ‘horn’. The animal has been known in English since the end of the 14th century, but the first reference to it calls it a kind of unicorn. Rhino- will be familiar to gardeners from the antirrhinum (mid 16th century), the alternative name for the snapdragon, whose name means ‘counterfeiting a nose’ from its appearance, while keras appears in keratin (mid 19th century), the substance from which horn is made.
- US English dictionary
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