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eohippus

e·o·hip·pus [  ō híppəss ] (plural e·o·hip·pus·es)


noun 
Definition:
 
small extinct horse: a small prehistoric horse that lived in North America. It was dog-sized and had four toes on the front feet and three on the back feet.

[Late 19th century. < modern Latin< Greek ēōs "dawn" + hippos "horse"]
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