Synonyms for Knee (same or very similar meaning)
WordNet sense 1 (hinge joint in the human leg connecting the tibia and fibula with the femur and protected in front by the patella):
genu, articulatio genus, human knee, knee jointWordNet sense 2 (joint between the femur and tibia in a quadruped; corresponds to the human knee):
stifleFrom the ODE community, based on WordNetadd/edit