柯林斯词典keratin /ˈkɛrətɪn/ (also ceratin) 1. N a fibrous protein that occurs in the outer layer of the skin and in hair, nails, feathers, hooves, etc 角蛋白 返回 keratin剑桥词典a strong natural protein , the main substance that forms hair , nails , hoofs , horns , feathers , etc. 角蛋白（一種堅靭、無色的天然蛋白質，是發、甲、蹄、角、羽毛等的主要組成物） 返回 keratin