Terms S-Z
Silks: Jacket and cap worn by jockeys.

Sire: Father of a foal.

Stallion: Uncastrated male horse.

Stud: Stallion.

Turf course: Grass covered race course.

Underlay: Horse whose odds are more promising than his potential to win.

Valet: A person who helps jockeys keep their wardrobe and equipment in order.

Weight: The assigned weight for a horse, including the jockey, equipment and lead weights if needed.

Workout: Exercise session at a predetermined distance.

Yearling: A horse that is one year old. The universal birthdate of horses is January 1.