warm·blood (wôrm?blo?od?)n. A horse of any of various breeds having a moderate build and mild temperament, originally developed by crossing draft horses with Arabians or Thoroughbreds, and often used for dressage and jumping.adj. Relating to or having the characteristics of a warmblood.[Translation of German Warmblut : warm, warm + Blut, blood (from the fact that warmblood horses are livelier than draft horses but less excitable than Arabians and Thoroughbreds).]American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.warmblood (?w??m?bl?d) na breed of horseCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014