ra·di·al 
(rādē-əl)
(rādē-əl)adj.
1.
a. Of, relating to, or arranged like rays or radii.
b. Radiating from or converging to a common center.
c. Having or characterized by parts so arranged or so radiating.
2. Moving or directed along a radius.
3. Anatomy Of, relating to, or near the radius or forearm.
4. Developing symmetrically about a central point.
n.
1. A radial part, such as a ray, spoke, or radius.
2. A radial tire.
[Middle English, from Medieval Latin radiālis, from Latin radius, ray, spoke, radius of a circle; see RAY1.]
radi·al·ly adv.