n. The femur or thigh-bone.n. In anatomy: The hipbone, os coxæ or os innominatum.n. The hip-joint.n. In entomology, the first or basal joint (sometimes called the hip) of an insect's leg, by which it is articulated to the body.n. The basal joint of the leg of a spider or a crustacean; a coxopodite (which see).