racehorse

[reys-hawrs]
noun
a horse bred or kept for racing, especially in flat races or steeplechases.

Origin:
1620–30; race1 + horse

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Collins
World English Dictionary
racehorse (ˈreɪsˌhɔːs)
 
n
a horse specially bred for racing

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
In this atmosphere even scientists have loosened the reins on that restless
  racehorse called speculation and let imagination run.
The only comparable increase in animals is found in a greyhound, racehorse, or
  wolf running at full speed.
The fun is in the human menagerie that collects around a top racehorse.
Flay is a longtime racehorse owner and fan of the sport.
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