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radial (adj.)

c. 1400, "of or like a ray or radius," from Medieval Latin radialis, from Latin radius "shaft, rod; spoke of a wheel; beam of light" (see radius). Meaning "arranged like the radii of a circle" is by 1750. As a noun, "a radiating or radial part," by 1872. As a type of tire, attested from 1965, short for radial-ply (tire), so called because the cords run at right angles to the circumference. Related: Radially.

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Definitions of radial from WordNet
1
radial (adj.)
relating to or near the radius;
the radial aspect of the forearm
radial (adj.)
relating to or moving along or having the direction of a radius;
radial velocity
radial (adj.)
issuing in rays from a common center; relating to rays of light;
radial heat
radial (adj.)
arranged like rays or radii; radiating from a common center;
radial symmetry
many cities show a radial pattern of main highways
Synonyms: stellate / radiate
2
radial (n.)
pneumatic tire that has radial-ply casing;
Synonyms: radial tire / radial-ply tire
From wordnet.princeton.edu