Science Dictionary
equid   (ěk'wĭd, ē'kwĭd)  Pronunciation Key 
Any of various hoofed mammals of the family Equidae, which includes horses, donkeys, and zebras. Equids have muscular bodies with long, slender legs adapted for running and a single hoofed digit at the end of each limb.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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WordNet
equid

noun
hoofed mammals having slender legs and a flat coat with a narrow mane along the back of the neck [syn: equine
WordNet® 3.0, © 2006 by Princeton University.
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Example sentences for equid
The miohippus ushered in a major new period of equid diversification.
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