Pliohippus

• (n.) An extinct genus of horses from the Pliocene deposits. Each foot had a single toe (or hoof), as in the common horse.
Found on http://thinkexist.com/dictionary/meaning/pliohippus/

Pliohippus

Pli`o·hip'pus noun [ New Latin , from English plio cene + Greek ... horse.] (Paleon.) An extinct genus of horses from the Pliocene deposits. Each foot had a single toe (or hoof), as in the common horse.
Found on http://www.encyclo.co.uk/webster/P/108

Pliohippus

extinct genus of primitive horses that inhabited North America during the Pliocene Epoch (from 5.3 to 1.6 million years ago). Pliohippus, the first ...
Found on http://www.britannica.com/eb/a-z/p/80
No exact match found