1. of or relating to automobile tires that have a strip under the tread and relatively little stiffening in the sidewalls; - Example: "radial-ply tires"
WordNet (r) 3.0 (2006):
radial-ply
adj 1: of or relating to automobile tires that have a strip
under the tread and relatively little stiffening in the
sidewalls; "radial-ply tires"