from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. An extinct pony of the genus Hipparion.
from the GNU version of the Collaborative International Dictionary of English
- n. 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.
from The Century Dictionary and Cyclopedia
- n. A genus of Miocene and Pliocene fossil horses, of the family Equidæ, having three toes, a median functional hoof with a false hoof on each side.
From the genus name. (Wiktionary)