A railroad freight car without sides or a roof.(noun)
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.
Use "flatcar" in a sentence
"Still, that train derailing in the Arizona desert and a flatcar dumping a steam tractor in my Cinerama-enhanced lap is fixed forever and all time in my brain."
"Containers are filled at their point of origin, sent to a port by truck or railroad flatcar, and hoisted aboard a vessel specially designed to carry as many as ten thousand so-called cans."
"He flung the reins from his hand and ran after the flatcar, heedless of the bullets crisscrossing through the air around him, and emptied the cylinder of his single-action Colt .45 at the machine gunner."