n. The upper arm, from the shoulder to the elbow, coinciding in extent with the humerus; the arm proper, as distinguished from the antebrachium or forearm.n. The humerus.n. An arm-like process of the brain. See phrases below.n. An armlike part of a body.n. In botany, an arm-like process or appendage: applied by Bentham to the projecting processes at the summit of the column in some orchids.