knuckle joint

Noun knuckle joint has 2 senses

• knuckle joint(n = noun.body) knuckle, metacarpophalangeal joint - a joint of a finger when the fist is closed;
is a kind of articulatio synovialis, diarthrosis, synovial joint
is a part of finger

• knuckle joint(n = noun.artifact) hinge joint - a joint allowing movement in one plane only;
is a kind of joint