Racehorse (noun)

A horse bred and trained specifically for racing competitions.

Origin:

Derived from the middle english word "rasehors" meaning "fast horse".

Examples:

1. The racehorse galloped around the track.
2. The jockey rode the racehorse to victory.
3. The racehorse was retired after a successful career.
4. He spent his entire fortune on buying racehorses.
5. He had a bet on the racehorse that he knew was going to win.