What term describes a young male horse?

The term that describes a young male horse is "colt." A colt is specifically used to refer to a young male horse that has not yet reached maturity, typically under four years of age. This term distinguishes them from male horses that are older and may be referred to as stallions or geldings, depending on whether they are intact or castrated.

In contrast, a foal is a term used for a young horse of either gender, usually under one year of age. A filly refers specifically to a young female horse, while a pony refers to a horse of a certain size, typically under 14.2 hands, regardless of its age or gender. Understanding these classifications is important for effectively communicating about horses and their development stages.