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, hyracothere.

1875–80; < Neo-Latin, equivalent to eo- eo- + Greek híppos horse

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World English Dictionary
eohippus (ˌiːəʊˈhɪpəs)
n , pl -puses
the earliest horse: an extinct Eocene dog-sized animal of the genus with four-toed forelegs, three-toed hindlegs, and teeth specialized for browsing
[C19: New Latin, from eo- + Greek hippos horse]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

"oldest known genus of the horse family," 1879, from Mod.L., from Gk. eos (see eo-) + hippos "horse."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
eohippus   (ē'ō-hĭp'əs)  Pronunciation Key 
See hyracotherium.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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