ˈɹeɪdi.əl ˈɹeɪdi.əl ˈstɛl.eɪt ˈstɛlˌeɪt 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 issuing in rays from a common center; relating to rays of light radial heat relating to or moving along or having the direction of a radius radial velocity relating to or near the radius the radial aspect of the forearm pneumatic tire that has radial-ply casing