noun.
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.
noun.
The humerus.
noun.
An arm-like process of the brain. See phrases below.
noun.
An armlike part of a body.
noun.
In botany, an arm-like process or appendage: applied by Bentham to the projecting processes at the summit of the column in some orchids.