femur

femur (noun; Latin femur, thigh): 1. (Arthropoda: Chelicerata) a. In spiders, the thigh; normally the stoutest segment, articulating to the body through the trochanter and coxa and bearing the patella and remaining leg segments at the distal end. b. In mites, segment of palp and legs, between the trochanter and genu; sometimes divided into femur 1 (proximal) and femur 2 (distal).

2. (Arthropoda: Insecta) The largest and stoutest part of the leg of most adults; the third segment, located between the trochanter and the tibia.