Definition of Femur

Femur: The femur is the bone in the leg that extends from the hip to the knee.

The femur constitutes the upper leg, that part of the leg above the knee. As compared to the lower leg which boasts two bones (the tibia and the fibula), the upper leg has only one bone, the femur, but a very large bone it is, the largest in the human body.

The word "femur" is the Latin word for thigh and the femur is familiarly known as the thigh bone.