eohippus
noun
eo·hip·pus
ˌē-ō-ˈhi-pəs
: any of a genus (Hyracotherium synonym Eohippus) of very small primitive horses from the Lower Eocene having 4-toed forefeet and 3-toed hind feet
called also dawn horse
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Merriam-Webster unabridged
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