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Protohippus

noun
Pro·​to·​hip·​pus | \ ˌprōtəˈhipəs\

Definition of Protohippus

: a genus of Pliocene horses approximating donkeys in size and having two small vestigial lateral toes that do not touch the ground

History and Etymology for Protohippus

New Latin, from prot- + -hippus

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