Mair is a word with Welsh origins that refers to a mare, a female horse that is usually aged three or more. Synonyms for mair include filly, which refers to a female horse aged less than four years, and broodmare, which specifically refers to a mare used for breeding purposes. Another synonym for mair is dam, which refers to a female horse that has produced offspring. Some slang terms used to refer to a mare include marengo, nag, and bronco, although these terms are often considered derogatory and should be used with caution. Overall, mair is a traditional term often used in horse racing circles but can be effectively substituted for more modern synonyms.