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1. a line segment from the center to the circumference of a circle or the surface of a sphere; the length of such a segment. Symbol r. 2. [TA] the bone on the outer or thumb side of the forearm, articulating proximally with the humerus and ulna and distally with the ulna and carpus. See illustration and see Plate 45. Click here to view image■Radius and ulna. (A), Anterior view; (B), posterior view.
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