柯林斯詞典keratin /?k?r?t?n/ (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劍橋詞典a strong natural protein , the main substance that forms hair , nails , hoofs , horns , feathers , etc. 角蛋白（一種堅(jiān)靭、無(wú)色的天然蛋白質(zhì)，是發(fā)、甲、蹄、角、羽毛等的主要組成物） 返回 keratin