Definition of radials:
(adj) :
Arranged like rays that radiate from, or converge to, a common centre.
(adj) :
(geometry) Of, or relating to a radius (line joining to a geometric centre).
(adj) :
(of a vehicle tyre) Having reinforcing cords placed in parallel across the tyre at 90 degrees to the direction of travel, especially as contrasted with cross-ply; see also radial tyre.
(adj) :
(anatomy) Of, or relating to the radius bone.
(adj) :
(entomology) Of, or relating to the radius (vein), and/or the wing areas next to it.
(adj) :
(botany) Developing uniformly on all sides.