femur /fē″mər/ pl. femora, femurs [L, thigh] , the thigh bone, which extends from the pelvis to the knee. It is largely cylindric and is the longest and strongest bone in the body. It has a large round head that fits the acetabulum of the hip, and it displays a large neck and several prominences and ridges for muscle attachments. In an erect posture it inclines medially, drawing the knee joint near the line of gravity of the body.
