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|Noun||1.||family Equidae - horses; asses; zebras; extinct animals|
mammal family - a family of mammals
order Perissodactyla, Perissodactyla - nonruminant ungulates: horses; tapirs; rhinoceros; extinct forms
equid, equine - hoofed mammals having slender legs and a flat coat with a narrow mane along the back of the neck
genus Mesohippus - a genus of Equidae
genus Protohippus - a genus of Equidae