(1) [TA], Relating to the radius (bone of the forearm), to any structures named from it, or to the radial or lateral aspect of the upper limb compared with the ulnar or medial aspect. SYN: radialis [TA]. (2) Relating to any radius. (3) Radiating; diverging in all directions from any given center. [L. radialis, fr. radius, ray, lateral bone of the forearm]