n. In anatomy: The bone of the upper arm, extending from the shoulder-joint to the elbow-joint.n. The proscapula of fishes: so called by Cuvier and his followers.n. The mesocoracoid of fishes: so designated by Owen and others.n. The shoulder or upper arm and associated parts.n. In entomology: The femur of the fore leg; the brachium.n. The subcostal or sub-marginal vein of the fore wing of certain hymenopters.n. The front corner of the thoracic region seen from above; the shoulder: this may be the prothorax, as in Coleoptera, or the mesothorax, as in Diptera.