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orohippus
CIDE DICTIONARY
orohippus, n. [NL., fr. Gr. 'o`ros, mountain (referring to the Rocky Mountain region) + "i`ppos horse.].
A genus of American Eocene mammals allied to the horse, but having four toes in front and three behind. [1913 Webster]
For further exploring for "orohippus" in Webster Dictionary Online
