Pronunciation (UK) IPA (key): /mɛː/ (US) IPA (key): /'mɛ(ə)r/, SAMPA: /mE@/ Audio (US)(file) Noun Singular mare Plural mares (countable) A mare is a female horse. We are mating our stallion with our mare. Related words colt filly foal gelding Wikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads