Definition of thumbpiece
1
: an appendage to a handle (as of a vessel) to afford a hold for the thumb
2
: a part designed to be operated by the thumb or thumb and fingers: such as
a
: a small inside knob for a night latch
b
: a small knob or button to operate a catch (as on a bracelet)
3
dialectal
: a small amount of food
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Merriam-Webster unabridged
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