Definitions from Wiktionary ( )

▸ noun:  (anatomy) The long bone in the forearm, on the side of the thumb.
▸ noun:  (zoology) The lighter bone (or fused portion of bone) in the forelimb of an animal.
▸ noun:  (entomology) One of the major veins of the insect wing, between the subcosta and the media; the vein running along the costal edge of the discal cell.
▸ noun:  (geometry) A line segment between any point of a circle or sphere and its center.
▸ noun:  (geometry) The length of this line segment.
▸ noun:  Anything resembling a radius, such as the spoke of a wheel, the movable arm of a sextant, or one of the radiating lines of a spider's web.
▸ noun:  (graph theory) The minimum eccentricity of any vertex, for a given graph.
▸ verb:  (transitive) To give a rounded edge to.
▸ noun:  (computing) Initialism of Remote Authentication Dial-In User Service.

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