SOME EQUESTRIAN TERMINOLOGY
Gelding – a castrated male horse
Stud – a mature and fully intact male horse
Mare – a mature (over 4 years old) female
Foal – a newborn horse
Colt – a young (under 4 years and not castrated) male (a variation on this is, “catch colt” — a colt born of uncertain lineage or the offspring of a mare bred unexpectedly. Also a child born out of wedlock).
Filly – a young (usually under 3 or 4 years) female
For list of words and phrases related to equestrian activities that are used in everyday common English go here.