Definitions:

1. A horse bred and trained specifically for pompetitive racing, known for their speed, agility, and stamina, making them ideal for flat racing, steeplechasing, or harness racing. NOUN
   • The Thoroughbred racehorse won first place in the prestigious derby last weekend.
2. A horse bred for racing. NOUN
   • The sleek racehorse gracefully galloped around the track, its powerful hooves pounding the ground.
3. A horse which competes in races. NOUN
   • The wealthy owner spared no expense in training his racehorse for the upcoming competition.

Synonyms:

• bangtail
• charger
• race horse
• racer
• thoroughbred