A mare is an adult female horse. If your new horse is a filly, a female baby horse, she'll grow up to be a mare.

Horse experts have many words to distinguish the age and sex of their animals, from foal, for any newborn horse, to stallion, a full grown male, to colt, a young male horse. Mares are known for being more easy-going than stallions, and because they're equally fast and powerful, they're as likely as males to be used for racing. Another meaning of mare ("sea" in Latin) is "dark areas of the moon," once believed to be actual oceans.

Definitions of mare
  1. noun
    female equine animal
    synonyms: female horse
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    broodmare, stud mare
    a female horse used for breeding
    type of:
    Equus caballus, horse
    solid-hoofed herbivorous quadruped domesticated since prehistoric times
  2. noun
    a dark region of considerable extent on the surface of the moon
    synonyms: maria
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    type of:
    part, region
    the extended spatial location of something
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