Definitions for knuckle joint
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Random House Webster's College Dictionary
knuck′le joint`(n.)
a joint forming a knuckle.
Category: Anatomy
a joint between two parts of a mechanism allowing movement in one plane only.
Category: Machinery
Origin of knuckle joint:
1860–1865
Princeton's WordNet
knuckle, knuckle joint, metacarpophalangeal joint(noun)
a joint of a finger when the fist is closed
knuckle joint, hinge joint(noun)
a joint allowing movement in one plane only
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"knuckle joint." Definitions.net. STANDS4 LLC, 2013. Web. 25 May 2013. <http://www.definitions.net/definition/knuckle joint>.