thumbhole

[thuhm-hohl]
noun
a hole into which a thumb can be inserted, as to provide a grip.

Origin:
1855–60; thumb + hole

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
thumbhole

noun
1. the hole in a woodwind that is closed and opened with the thumb 
2. a finger hole made to fit the thumb (as in a bowling ball) 
WordNet® 3.0, © 2006 by Princeton University.
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Example sentences
We had difficult getting her thumb into the thumbhole and the whole mitten kept slipping off.
The blade shall have a thumbhole through the blade for ease in opening.
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