pastern

n. (lit ) lower part of a horse’s leg betweenthe fetlock and hoof,hoof（原指马腿下部）距毛球关节与马蹄之间的部分（胫骨）,（转指）蹄。
△H.V.3.7. 11:“I willnot change my horse with any that treads but on fourpasterns.”i.e.with any horse that treads merely onfour natural hooves.(He would only exchange it for aflying horse.)我不愿意拿我这匹马跟任何其他用四只蹄子跑路的凡马交换。

pastern[ˈpæstə:n]

n. 胶
‖ pastern joint马球节