形容詞 opposable:

1. capable of being placed opposite to something
   同義詞：apposable

1. Having four feet with opposable first digits, as primates other than human beings.
   四足如手的有四足和與其他腳趾相對的第一個足趾的; 如除人類以外的靈長類動物

op.pos.a.ble

adj.（形容詞）
Possible to oppose or resist.
可對抗的：可能反對或抵制的
That can be placed opposite something else:
可與…相對的：
例句：
The thumb is an opposable digit.
大拇指與食指處于相對位置

【引伸】
oppos.abil.ity
n.（名詞）