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|Noun||1.||ceratin - a fibrous scleroprotein that occurs in the outer layer of the skin and in horny tissues such as hair, feathers, nails, and hooves|
feather, plumage, plume - 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); helps to prevent heat loss; "he combed his hair"; "each hair consists of layers of dead keratinized cells"
horn - the material (mostly keratin) that covers the horns of ungulates and forms hooves and claws and nails