Having a body structure arranged like spokes radiating out from the centre of a wheel.
"the arrangement of parts in an organ or organism such that cutting through the center of the structure in any direction produces two halves that are mirror images of each other. The stems and roots of plants usually show radial symmetry, while all animals belonging to Cnidaria (e.g. jellyfish) and Echinodermata (e.g. starfish) are radially symmetrical - and typically sessile - in their adult form" (503)
Divisible into equal halves by two or more planes of symmetry (Fig. 4.18); also called actinomorphic. Example 1, Example 2