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Answer for the clue "Pliocene horse approaching donkeys in size ", 11 letters:
protohippus

Word definitions for protohippus in dictionaries

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
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.

WordNet Word definitions in WordNet
n. Pliocene horse approaching donkeys in size

Wikipedia Word definitions in Wikipedia
Protohippus is an extinct three-toed genus of horse . It was roughly the size of a modern donkey. Fossil evidence suggests that it lived during the Late Miocene and Early Pliocene, from about 14 Ma to 6 Ma. Analysis of Protohippus' skull and teeth suggests ...