O″re‐o‐don (?), n. [Gr. ὄροσ, -εοσ, mountain + οδοὔσ, οδὄντοσ, 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.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.