Mesohippus

2 definitions found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Mesohippus \Mes`o*hip"pus\, n. [NL., fr. Gr. me`sos middle + ? a
     horse.] (Paleon.)
     An extinct mammal of the Horse family, but not larger than a
     sheep, and having three toes on each foot.
     [1913 Webster]



From WordNet (r) 2.0 [wn]:

  mesohippus
       n : North American 3-toed Oligocene animal; probably not
           directly ancestral to modern horses