oreodon

from The Collaborative International Dictionary of English v.0.48

Oreodon \O"re*o*don\, prop. n. [Gr. 'o`ros, -eos, mountain +
   'odoy`s, 'odo`ntos, tooth.] (Paleon.)
   A genus of extinct herbivorous mammals, abundant in the
   Tertiary formation of the Rocky Mountains. It is more or less
   related to the camel, hog, and deer.
   [1913 Webster]