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opposable thumb

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Cultural Dictionary

opposable thumb

A thumb that can be used for grasping.

Note: Opposable thumbs are one of the distinguishing features of primates.
Note: The opposable thumb of human beings allows us to use tools.
The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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