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1560s, from Latin femur "thigh," of unknown origin; borrowed first as an architectural term, 1799 as "thighbone."
femur fe·mur (fē'mər)
n. pl. fe·murs or fem·o·ra (fěm'ər-ə)
The long bone of the thigh, and the longest and strongest bone in the human body, situated between the pelvis and the knee and articulating with the hipbone and with the tibia and patella. Also called thighbone.
The long bone of the thigh or of the upper portion of the hind leg. See more at skeleton.
upper bone of the leg or hind leg. The head forms a ball-and-socket joint with the hip (at the acetabulum), being held in place by a ligament (ligamentum teres femoris) within the socket and by strong surrounding ligaments. In humans the neck of the femur connects the shaft and head at a 125 angle, which is efficient for walking. A prominence of the femur at the outside top of the thigh provides attachment for the gluteus medius and minimus muscles. The shaft is somewhat convex forward and strengthened behind by a pillar of bone called the linea aspera. Two large prominences, or condyles, on either side of the lower end of the femur form the upper half of the knee joint, which is completed below by the tibia (shin) and patella (kneecap). Internally, the femur shows the development of arcs of bone called trabeculae that are efficiently arranged to transmit pressure and resist stress. Human femurs have been shown to be capable of resisting compression forces of 800-1,100 kg (1,800-2,500 pounds)