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Noun knuckle has 1 sense
knuckle, knuckle joint, metacarpophalangeal joint - a joint of a finger when the fist is closed--1 is a kind of weapon, arm, weapon system; synovial joint, articulatio synovialis, diarthrosis; weapon, arm, weapon system; synovial joint, articulatio synovialis, diarthrosis
 --1 is a part of finger
 
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