Is it thumb a finger?
No, Your thumb is different from your fingers. Your fingers have two joints and three bones called phalanges or phalanxes. A thumb only has one joint and two phalanges.
No, the thumb is a digit, but not technically a finger.
No, The thumb contrasts with each of the other four by being the only digit that: Is opposable to the other four fingers. Has two phalanges rather than three. Has greater breadth in the distal phalanx than in the proximal phalanx
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