metacarpophalangeal joint

Noun
  1. A joint of a finger when the fist is closed (synset 105592855)
    is a type of: articulatio synovialis, diarthrosis, synovial joint - a joint so articulated as to move freely
    is a part of: finger - any of the terminal members of the hand (sometimes excepting the thumb)
    same as: knuckle, knuckle joint

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