noun co·ty·lo·saur \ˈkä-tə-lō-ˌsȯr, -lə-ˌsȯr, kə-ˈti-lə-\

Definition of cotylosaur

  1. :  any of an order (Cotylosauria) of extinct primitive reptiles of the Carboniferous to Triassic with short legs and massive bodies that were prob. the earliest truly terrestrial vertebrate animals

Origin and Etymology of cotylosaur

ultimately from Greek kotylē + sauros lizard

First Known Use: 1895

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