<p><strong>noun</strong></p><ul><li>femur</li><li>plural: femurs, femora</li><li>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.</li><li>Zoology: a corresponding bone of the leg or hind limb of an animal.</li><li>Entomology: the third segment of the leg of an insect (counting from the base), situated between the trochanter and the tibia.</li></ul>