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The Collaborative International Dictionary
Kneejoint

Kneejoint \Knee"joint`\, n.

  1. The joint of the knee.

  2. (Mach.) A toggle joint; -- so called because consisting of two pieces jointed to each other end to end, making an angle like the knee when bent.

Wiktionary
kneejoint

n. 1 The joint of the knee. 2 (context engineering English) A toggle joint; so called because it consists of two pieces jointed to each other end to end, making an angle like the knee when bent.