Dictionary of Human Evolution and Biology

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Opposable Digit(s)

1. some primates, but not humans, have a great toe (hallux) that can rotate to bring its tip into contact, or opposition, with the other digits of the foot.

2. an opposable thumb, a highly mobile pollex that is capable of rotating to the other digits, which allows the grasping of objects and is necessary for a precision grip. A characteristic of primates, and especially well developed in humans.

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