| pliohippus | <paleontology> An extinct genus of horses from the Pliocene deposits. Each foot had a single toe (or hoof), as in the common horse. Origin: NL, fr. E. Pliocene + Gr. Horse. Source: Websters Dictionary (01 Mar 1998) |
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| pliosaurus | <paleontology> An extinct genus of marine reptiles allied to Plesiosaurus, but having a much shorter neck. Origin: NL, from Gr. Greater + lizard. Source: Websters Dictionary (01 Mar 1998) |