Hypertext Webster Gateway: "kneejoint"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
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.
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