名詞 keratin:

1. a fibrous scleroprotein that occurs in the outer layer of the skin and in horny tissues such as hair feathers nails and hooves
   同義詞：ceratin

1. A human hair consists mainly of a protein called Keratin. It also contains some moisture and the trace metals and minerals found in the rest of the body.
   人類的頭發(fā)主要由一種叫角朊的蛋白質(zhì)組成，并含有水分及在身體其他部分也可找到的微量金屬和礦物質(zhì)。

ker.a.tin

n.（名詞）
A tough, insoluble protein substance that is the chief structural constituent of hair, nails, horns, and hoofs.
角蛋白：一種不溶解的較硬的蛋白物質(zhì)，是頭發(fā)、指甲、角和蹄的主要結(jié)構(gòu)成分

來源：
Greek keras kerat- [horn] * see ker-
希臘語 keras kerat- [角] *參見 ker-
-in
-in

【引伸】
kerat.inous