Femur

The human femur is tougher than concrete.

U.S. Secretary of State John Kerry broke his right femur in a cycling accident Sunday in France.

The femoral head is a round knob of bone at the top of the femur, also known as the thigh bone.

Tom broke his femur.

The scientists say they unearthed two enormous vertebrae and a femur, or thigh bone, of a plant-eating sauropod species called Alamosaurus.