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
     adj 1: relating to or near the radius; "the radial aspect of the
            forearm"
     2: relating to or moving along or having the direction of a
        radius; "radial velocity"
     3: issuing in rays from a common centerXs; relating to rays of
        light; "radial heat"
     4: arranged like rays or radii; radiating from a common center;
        "radial symmetry"; "a starlike or stellate arrangement of
        petals"; "many cities show a radial pattern of main
        highways" [syn: {stellate}]

radial
     n : pneumatic tire that has radial-ply casing [syn: {radial tire},
          {radial-ply tire}]