knuckle joint

knuckle joint

noun
1.
a joint forming a knuckle.
2.
Machinery. a joint between two parts allowing movement in one plane only.

Origin:
1860–65

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
knuckle joint
 
n
1.  any of the joints of the fingers
2.  mechanical engineering a hinged joint between two rods, often a ball and socket joint

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