Pliohippus
Pronunciation : Pli`o*hip"pus
Part of Speech : n.
Etymology : [NL., fr. E. pliocene + Gr. (Paleon.)
Definition : Defn: An extinct genus of horses from the Pliocene deposits. Each foot had a single toe (or hoof), as in the common horse.
Source : Webster's Unabridged Dictionary, 1913