cotylosaur
noun
co·ty·lo·saur
| \ ˈkä-tə-lō-ˌsȯr
, -lə-ˌsȯr, kə-ˈti-lə-\
, -lə-ˌsȯr, kə-ˈti-lə-\
Definition of cotylosaur
: any of an order (Cotylosauria) of extinct primitive reptiles of the Carboniferous to Triassic with short legs and massive bodies that were probably the earliest truly terrestrial vertebrate animals
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