Ball-of-the-thumb Definition

noun

(anatomy, informal) The fleshy portion, opposite the nail, of the first segment (first phalange) of the human thumb.

Wiktionary

(anatomy) The most fleshy portion of the palm of the human hand, located adjacent to the second joint of the thumb: the thenar eminence.

Wiktionary
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Other Word Forms of Ball-of-the-thumb

Noun

Singular:
ball-of-the-thumb
Plural:
balls of the thumb

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