snow tire definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
a tire with a deep tread, and sometimes protruding studs, for added traction on snow or ice
snow tire definition by American Heritage Dictionary
A tire with a deep tread or studs to give added traction on snow-covered surfaces.