a horse race for three-year-olds, run annually since 1875, on the first Saturday in May, at Churchill Downs in Louisville, Ky.: the first race in the Triple Crown.
British Dictionary definitions for Kentucky Derby
Kentucky Derby
noun
1.
a race for three-year-old horses run annually since 1875 at Louisville, Kentucky
Kentucky Derby in Culture
Kentucky Derby definition
The most famous American horse race, held each spring at Churchill Downs racetrack in Kentucky.