Definition of eohippus
: any of a genus (Hyracotherium syn. Eohippus) of very small primitive horses from the Lower Eocene having 4-toed forefeet and 3-toed hind feet —called also dawn horse
Origin and Etymology of eohippus
New Latin, from eo- + Greek hippos horse — more at equine
First Known Use: circa 1879
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