colt
n. countable C2 Proficiency US //ˈkoʊɫt// UK //kˈəʊlt// colt
n. a young male horse that is under four years old. You use this word for a horse that is not yet fully grown.
n. a young male horse, typically under the age of four. Often used in racing contexts to distinguish from fillies or older stallions.
The young colt ran across the field with its mother.
The stable owner decided to enter the promising colt into the local race for three-year-olds.
While the filly showed more immediate speed, the trainer believed the colt possessed the physical frame and temperament required for longer, more demanding endurance trials.