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keratin noun [ C or U ] biology specialized uk/ˈker.ə.tɪn/ us/ˈker.ə.tɪn/ 角蛋白（一种坚韧、无色的天然蛋白质，是发、甲、蹄、角、羽毛等的主要组成物）a strong natural protein, which is the main substance that forms hair, nails, hooves, horns, feathers, etc. Rhino horn is made of keratin, the same material as hair and fingernails. We have studied the composition, shape, and behaviour of feather keratins. 更多例句- Without biotin, also known as vitamin B7 or vitamin H, the body cannot metabolize keratin to make nails.
- Keratin makes the nails strong, but external trauma or an underlying health condition can cause thin layers of the nail to peel away.
- Mohair fibre, like wool, is composed chiefly of the protein substance keratin.
- Scientists have documented population collapses among these frogs due to a fungus which infects keratin, a hard protein that forms the outer layer of frogs' skin.
- Different types of filaments are composed by a variety of proteins, including keratins.
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