knee in WordNet English dictionary

1. hinge joint in the human leg connecting the tibia and fibula with the femur and protected in front by the patella
   knee  knee joint  human knee  articulatio genus  genu 
   
2. joint between the femur and tibia in a quadruped; corresponds to the human knee
   stifle  knee 
   
3. the part of a trouser leg that provides the cloth covering for the knee
   knee