Definition of "Radial" :

noun: pneumatic tire that has radial-ply casing

adjective: arranged like rays or radii; radiating from a common center

"Radial symmetry."

adjective: issuing in rays from a common center; relating to rays of light

"Radial heat."

adjective: relating to or moving along or having the direction of a radius

"Radial velocity."

adjective: relating to or near the radius

"The radial aspect of the forearm."