Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio.
any of a breed of light horse developed from the Thoroughbred and specially trained for trotting or pacing in harness races
Used by arrangement with John Wiley & Sons, Inc.
The American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Any of an American breed of trotting and pacing horses developed especially for harness racing by crossing Thoroughbreds with Morgans and other breeds.