Source : Webster's Revised Unabridged Dictionary (1913)

Oreodon \O"re*o*don\, 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.