An animal or animals killed by being struck by a motor vehicle.
Slang One that has failed or been defeated and is no longer worthy of consideration: "Many radio rightists betray a truculent nostalgia for the old foes who became their roadkill” ( Richard Corliss).
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.