KERATIN /ˈkɛr.ə.tᵊn/ Scrabble 11 Words With Friends 12 Definition noun a fibrous scleroprotein that occurs in the outer layer of the skin and in horny tissues such as hair, feathers, nails, and hooves. — synonyms: ceratin See all 139 words you can make from KERATIN → 7-letter words Words starting with K Words ending with N ← Unscramble different letters