Miohippus \Mi`o*hip"pus\ (m[imac]`[-o]*h[i^]p"p[u^]s), n. [NL.,
fr. Gr. mei`wn less + "ippo`s horse.] (Paleon.)
An extinct Miocene mammal of the Horse family, closely
related to the genus {Anhithecrium}, and having three usable
hoofs on each foot.
[1913 Webster]