opposable
adjectiveUK /əˈpəʊzəbl/
US /əˈpoʊzəbl/
Able to be placed against another finger so you can hold things.
Humans have opposable thumbs that help them grip tools.
OTHER MEANINGS
2. Capable of being opposed or resisted.
The plan was opposable by any member of the committee.
3. Able to be placed opposite something else.
The leaves grow in opposable pairs along the stem.
4. In zoology, describing a digit that can touch the other digits of the same hand.
Monkeys have opposable big toes as well as thumbs.