orohippus definition

  • noun:
    • A genus of United states Eocene mammals allied towards the horse, but having four toes in-front and three behind.
    • A genus of fossil horses, of the family Equidæ, based upon remains from the Eocene of North America, having four toes on the fore feet and three on the hind feet. There are several species, all of very small size, only about as large as a fox.
    • [lowercase] A species for the above genus.
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