keratin

noun/ˈkɛrətɪn/

Frequency rank: #19,013 most common English word

Meaning

A fibrous structural protein that forms hair, nails, horns, and the outer layer of skin.

Illustration for the English word “keratin”

Example sentence

Your hair and nails are made primarily of keratin, which is tough protein material.

Synonyms & related words

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