Mesohippus
/ˌmɛsə(ʊ)ˈhɪpəs/Palaeontology
noun
A genus of extinct small three-toed horses known from fossils found in Oligocene deposits in North America; a horse of this genus.
Origin
Late 19th century. From scientific Latin Mesohippus, genus name from meso- + -hippus (in Protohippus, Orohippus).