Knuckle joint Meaning, Definition & Usage
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noun a joint of a finger when the fist is closed
metacarpophalangeal joint; knuckle.
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noun a joint allowing movement in one plane only
hinge joint.
WordNet
Definitions
(Mach.) , a hinge joint, in which a projection with an eye, on one piece, enters a jaw between two corresponding projections with eyes, on another piece, and is retained by a pin which passes through the eyes and forms the pivot.
