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eohippus

[ee-oh-hip-uh s] /ˌi oʊˈhɪp əs/
noun
1.
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.
Origin
1875-1880
1875-80; < Neo-Latin, equivalent to eo- eo- + Greek híppos horse
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for eohippus

eohippus

/ˌiːəʊˈhɪpəs/
noun (pl) -puses
1.
the earliest horse: an extinct Eocene dog-sized animal of the genus with four-toed forelegs, three-toed hindlegs, and teeth specialized for browsing
Word Origin
C19: New Latin, from eo- + Greek hippos horse
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for eohippus
eohippus
"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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eohippus in Science
eohippus
  (ē'ō-hĭp'əs)   
See hyracotherium.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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