The meaning of FEMUR is the proximal bone of the hind or lower limb that extends from the hip to the knee —called also thigh bone.

The femur (/ ˈfiːmər /; pl.: femurs or femora / ˈfɛmərə /), [ 1 ][ 2 ] or thigh bone, is the only bone in the thigh — the region of the lower limb between the hip and the knee. In many four-legged animals the femur is the upper bone of the hindleg.

plural femurs, femora [fem, -er-, uh]. Anatomy. a bone in the human leg extending from the pelvis to the knee, that is the longest, largest, and strongest in the body; thighbone. Zoology. a corresponding bone of the leg or hind limb of an animal.