The Collaborative International Dictionary
Kneejoint
Kneejoint \Knee"joint`\, n.
The joint of the knee.
(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.