'Mesohippus' definitions:
Definition of 'mesohippus'
(from WordNet)
noun
North American three-toed Oligocene animal; probably not directly ancestral to modern horses
Definition of 'Mesohippus'
From: 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]