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1. An opening made to fit a thumb, as in a bowling ball.
2. Music The hole on a wind instrument that is opened or closed with the thumb.
1. a hole for putting the thumb into, usually for improving grip
2. (Instruments) a hole on a woodwind instrument that is opened and closed by the thumb
a hole into which a thumb can be inserted, as to provide a grip.
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|Noun||1.||thumbhole - the hole in a woodwind that is closed and opened with the thumb|
hole - an opening deliberately made in or through something
|2.||thumbhole - a finger hole made to fit the thumb (as in a bowling ball)|
finger hole - a hole for inserting a finger