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hyracotherium

[hahy-ruh-koh-theer-ee-uh m] /ˌhaɪ rə koʊˈθɪər i əm/
noun, plural hyracotheria
[hahy-ruh-koh-theer-ee-uh] /ˌhaɪ rə koʊˈθɪər i ə/ (Show IPA)
1.
Also, hyracothere.
Origin
< New Latin (1840): a genus name; see hyrax, -o-, -there

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
1875-80; < New Latin, equivalent to eo- eo- + Greek híppos horse
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for hyracothere

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
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Word Origin and History for hyracothere

Eohippus

n.

oldest known genus of the horse family, 1879, from Modern Latin, from Greek eos (see eo-) + hippos "horse" (see equine).

Online Etymology Dictionary, © 2010 Douglas Harper
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hyracothere in Science
eohippus
  (ē'ō-hĭp'əs)   
See hyracotherium.
hyracotherium
  (hī'rə-kō-thîr'ē-əm)   
Plural hyracotheria
A small primitive horse that lived about 50 million years ago during the early Eocene Epoch. It had three or four hoofed toes on each foot and is considered by some to be the ancestor of modern horses. It is sometimes called the "dawn horse," a translation of its earlier scientific name, Eohippus.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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