| NOUN | substance | ceratin, keratin | a fibrous scleroprotein that occurs in the outer layer of the skin and in horny tissues such as hair, feathers, nails, and hooves |
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| Meaning | A fibrous scleroprotein that occurs in the outer layer of the skin and in horny tissues such as hair, feathers, nails, and hooves. | |
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| Synonym | keratin | |
| Broader | scleroprotein, albuminoid | A simple protein found in horny and cartilaginous tissues and in the lens of the eye |
| Substance of | feather, plume, plumage | The light horny waterproof structure forming the external covering of birds |
| hair | A covering for the body (or parts of it) consisting of a dense growth of threadlike structures (as on the human head) | |
| horn | The material (mostly keratin) that covers the horns of ungulates and forms hooves and claws and nails | |
| Spanish | ceratina, keratina, queratina | |
| Catalan | ceratina, queratina | |
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