Wordnet 3.0
NOUN (1)
1. 
 the property of symmetry about an axis; 
- Example: "the starfish illustrates radial symmetry"
The Collaborative International Dictionary of English v.0.48:
Radial \Ra"di*al\ (r[=a]"d[i^]*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;
   (Zool.) radial vessels or canals; (Anat.) the radial artery.
   [1913 Webster]
   Radial symmetry. (Biol.) See under Symmetry.
      [1913 Webster]
WordNet (r) 3.0 (2006):
radial symmetry
    n 1: the property of symmetry about an axis; "the starfish
         illustrates radial symmetry" [ant: radial asymmetry]