eohippus
noun
eo·hip·pus
| \ ˌē-ō-ˈhi-pəs
\
\
Definition of eohippus
: 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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