radial (Adjective) — Relating to or near the radius. ex. "the radial aspect of the forearm"
radial (Adjective) — Relating to or moving along or having the direction of a radius. ex. "radial velocity"
radial (Adjective) — Issuing in rays from a common centre; relating to rays of light. ex. "radial heat"
radial (Adjective) — Arranged like rays or radii; radiating from a common centre. ex. "radial symmetry" ex. "many cities show a radial pattern of main highways"
radial (Noun) — Pneumatic tire that has radial-ply casing.