eohippus
American Heritage Dictionary:
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e·o·hip·pus
Saunders Veterinary Dictionary:
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Eohippus
The oldest known ancestor of the horse. A short, 25–50 cm high, rodent-like animal with four toes on each forefoot and three on each hind. Each toe had a hoof. The Eohippus survived by its speed. See also mesohippus.
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American Heritage Dictionary
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.
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