/ee'oh hip"euhs/ , n.
the earliest known horse, a member of the extinct genus Hyracotherium ( Eohippus ), from the early Eocene Epoch of the Northern Hemisphere; a terrier-sized herbivore having four hoofed toes on each forefoot and three on each hind foot, and low-crowned teeth. Also called dawn horse, hyracotherium .
[ 1875-80; eo- EO- + Gk híppos horse ]