Noun knuckle joint has 2 senses
  1. knuckle, knuckle joint, metacarpophalangeal joint - a joint of a finger when the fist is closed
    --1 is a kind of synovial joint, articulatio synovialis, diarthrosis
    --1 is a part of finger
  2. knuckle joint, hinge joint - a joint allowing movement in one plane only
    --2 is a kind of joint
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