Geom. Equivalent to medium diameter measured radio. Distance between the Center and the edge of the circumference. Anat. Bone of the forearm, is shorter than the ulna. Quim. Radio is the name of a chemical element, its symbol is Ra and atomic number is 88. It is immaculate white and is radioactive. Com. Apocope of broadcasting (means of communication that uses waves Hertzianas) and receiver (receiver of broadcasting, apparatus by which we receive spoken emissions). In engineering it also means curvature. In cycling, radio is a thin metal rod that will the pinion wheel Rhine.