Source : Webster's Revised Unabridged Dictionary (1913)

Radial \Ra"di*al\, a. [Cf. F. radial. See {Radius}.]
   Of or pertaining to a radius or ray; consisting of, or like,
   radii or rays; radiated; as, (Bot.) radial projections;
   (Zo["o]l.) radial vessels or canals; (Anat.) the radial
   artery.

   {Radial symmetry}. (Biol.) See under {Symmetry}.

Source : WordNet®

radial symmetry
     n : the property of symmetry about an axis; "the starfish
         illustrates radial symmetry" [ant: {radial asymmetry}]