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Added 9 October 2026

keratin

/ˈkɛɹətɪn/ noun

noun Definition from Wiktionary (CC BY-SA). Pronunciation from Wiktionary, via Kaikki.org. More about keratin at Wordnik → Where our words come from →

The protein of which hair and nails are composed.

Origin

Borrowed from German Keratin, from Ancient Greek κέρας (kéras, “horn”) + -in. Doublet of carat.

From Wiktionary, via Kaikki.org (CC BY-SA)

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