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Definition of THUMB
: the short thick digit of the human hand that is analogous in position to the big toe and differs from the other fingers in having only two phalanges, allowing greater freedom of movement, and being opposable to each of them; also: a corresponding digit in lower animals
: the part of a glove or mitten that covers the thumb
: the short and thick first or most preaxial digit of the human hand that differs from the other fingers in having only two phalanges, in having greater freedom of movement, and in being opposable to the other fingers