Etymology
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opposable (adj.)

1660s, "capable of being withstood," from oppose + -able. In reference to the thumbs of humans and certain other animals, "capable of being so placed as to be in opposition," by 1819. Related: Opposability.

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Definitions of opposable

opposable (adj.)
capable of being placed opposite to something;
the thumb is opposable to the forefinger
Synonyms: apposable
From wordnet.princeton.edu