n. The thigh.n. In anatomy, the thigh-bone; the single long bone which extends along the thigh from the hip-joint to the knee-joint, articulating above with the pelvis, and below with the tibia, or the tibia and fibula.n. In entomology, the thigh; the third joint of the leg, between the trochanter and the shank or tibia. See cut under corbiculum.n. In architecture, the interstitial member between two channels in the triglyph of the Doric order.