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opposable thumb

/ ə-pōzə-bəl /

  1. A thumb that can be placed opposite the fingers of the same hand. Opposable thumbs allow the digits to grasp and handle objects and are characteristic of primates.


opposable thumb

  1. A thumb that can be used for grasping.
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Notes

Opposable thumbs are one of the distinguishing features of primates .
The opposable thumb of human beings allows us to use tools.

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