noun, plural hyracotheria [hahy-ruh-koh-theer-ee-uh] .
Also, hyracothere.

< Neo-Latin (1840): a genus name; see hyrax, -o-, -there

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hyracotherium   (hī'rə-kō-thîr'ē-əm)  Pronunciation Key 
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.
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