hipparion

top

CIDE DICTIONARY

hipparion, n. [NL., fr. Gr. a pony, dim. of a horse.].

An extinct genus of Tertiary mammals allied to the horse, but three-toed, having on each foot a small lateral hoof on each side of the main central one. It is believed to be one of the ancestral genera of the Horse family.

For further exploring for "hipparion" in Webster Dictionary Online