ball of the thumb
/B AO1 L AH0 V DH AH0 TH AH0 M/noun
- 1
(anatomy, informal) The fleshy portion, opposite the nail, of the first segment (first phalange) of the human thumb.
- 2
(anatomy) The most fleshy portion of the palm of the human hand, located adjacent to the second joint of the thumb: the thenar eminence.
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