protohippus

Protohippus

Pro`to*hip"pus\, n. [NL., from Gr. ? first + ? horse.] (Paleon.) A genus of fossil horses from the Lower Pliocene. They had three toes on each foot, the lateral ones being small.
Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
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