A horse bred and trained specifically for racing, usually valued for its speed, agility, and athletic ability.
Simple compound: 'race' (a fast competition) plus 'horse.' Horse racing became a major sport in Europe starting in the 1600s, and special breeding for racing horses began immediately.
Racehorses are measured in 'hands' and 'thoroughbreds' are registered like people are—they have family trees and bloodlines tracked for centuries, which has created breeds so specialized they can run faster than wild horses ever could.
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