One of a breed of strong saddle horses developed in the western United States.(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 "quarter horse" in a sentence
"I was still riding Misty bareback, but Maureen had switched to a nice quarter horse named Ash Bill."