eohippus

Noun
  1. Earliest horse;
    Extinct primitive dog-sized four-toed Eocene animal (synset 102378514)
    is a type of: equus caballus, horse - solid-hoofed herbivorous quadruped domesticated since prehistoric times
    belongs to: genus hyracotherium, hyracotherium - extinct horse genus; formerly called eohippus
    same as: dawn horse

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