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. 2012.
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Knuckle joint is always a great word to know.
So is ninnyhammer. Does it mean:
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
a fool or simpleton; ninny.
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

Collins English Dictionary - Complete & Unabridged 10th Edition
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