Capable of being opposed or resisted.

Capable of being placed opposite something else; as, the thumb is opposable to the forefinger.

Capable of being placed opposite something else; said of the first toe of the hind foot in an opossum in the sense that it can be placed opposite each of the other toes on that same foot.

describes the position of the thumb relative to the fingers. An opposable thumb allows raccoons to grasp and manipulate small objects.

A digit (usually the thumb) capable of moving so as to touch with its tip the tip of any other digit on the same limb.

The capability of being placed against the remaining digits of a hand or foot; e.g., the ability of the thumb to touch the tips of the fingers on that hand.