Foal/fəʊl/ Definition 1 of 2Pro Tip 1/3Age Matters Foal refers to age, usually under a year. Beyond that, other terms like 'yearling' are used. That foal turned into a yearling last month. Pro Tip 2/3Gender Neutral Foal is gender-neutral. It doesn't specify if the young horse is male or female. The farmer welcomed a new foal to the stable, gender yet unknown. Pro Tip 3/3Mare's Offspring Often, 'foal' conveys the relationship between a mare and her baby. The mare nuzzled her foal affectionately.