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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]