n. hinge joint in the human leg connecting the tibia and fibula with the femur and protected in front by the patella
n. joint between the femur and tibia in a quadruped; corresponds to the human knee
n. the part of a trouser leg that provides the cloth covering for the knee
n. 膝( knee的复数形式 ); 膝盖; （裤子的）膝部; 坐下时)大腿朝上的面