Keratin
//ˈkɛrətɪn//
"Keratin" in a Sentence (4 examples)
Keratin is one of a family of fibrous structural proteins known as scleroproteins.
Keratin is a fibrous protein produced by chordates. It may be found in hair, skin, claws, and wool.
Cats' tongues are covered in little hooks made of keratin.
Porcupines are covered in quills that are made of keratin (the same stuff that makes our hair and nails.) There are about 30,000 quills that cover a porcupine’s body!
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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.