"knees" in the noun sense
1. knee, knee joint, human knee, articulatio genus, genu
hinge joint in the human leg connecting the tibia and fibula with the femur and protected in front by the patella
2. stifle, knee
joint between the femur and tibia in a quadruped corresponds to the human knee
the part of a trouser leg that provides the cloth covering for the knee
Source: WordNet® (An amazing lexical database of English)
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