from the GNU version of the Collaborative International Dictionary of English
- n. A genus of fossil horses from the Lower Pliocene. They had three toes on each foot, the lateral ones being small.
from The Century Dictionary and Cyclopedia
- n. A genus of fossil horses of the family Equidæ, founded by Leidy in 1858 upon remains from the early Pliocene of North America.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. Pliocene horse approaching donkeys in size
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