Or`o*hip"pus\, n. [NL., fr. Gr. 'o`ros, mountain (referring to the Rocky Mountain region) + "i`ppos horse.] (Paleon.) A genus of American Eocene mammals allied to the horse, but having four toes in front and three behind.
Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
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