1. a horse bred and trained specifically for racing

Examples

• The champion racehorse won three major competitions this season.
• She invested in a promising young racehorse from Kentucky.
• The racehorse thundered down the track toward the finish line.
• Training a racehorse requires years of dedication and expertise.
• The retired racehorse now enjoys a peaceful life in the pasture.
• Spectators cheered as their favorite racehorse took the lead.