opposable

形容词 opposable:

1. capable of being placed opposite to something
   同义词：apposable

1. Having four feet with opposable first digits, as primates other than human beings.
   四足如手的有四足和与其他脚趾相对的第一个足趾的; 如除人类以外的灵长类动物

op.pos.a.ble

adj.（形容词）
Possible to oppose or resist.
可对抗的：可能反对或抵制的
That can be placed opposite something else:
可与…相对的：
例句：
The thumb is an opposable digit.
大拇指与食指处于相对位置

【引伸】
oppos.abil.ity
n.（名词）