Definition Of opposable

adjective

(of the thumb of a primate) capable of moving toward and touching the other digits on the same hand.

Digits 1 and 2 on the forefeet are opposable to digits 3-5, and the hindfoot has a well-developed hallux.

Example Of opposable

  • A panda with a fully opposable thumb that is lacking in its nearest relatives is hard to explain via evolution.

  • Digits 1 and 2 on the forefeet are opposable to digits 3-5, and the hindfoot has a well-developed hallux.

  • In other words, our ancestral rodents did not merely evolve gradually until they emerged as bipeds with opposable thumbs.

  • The first 2 digits of their forefeet are opposable to the other three in the more arboreal species.

  • Their hands had only three digits: two fingers and an opposable thumb.


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