co·ty·lo·saur noun \ˈkä-tə-lō-ˌsȯr, kə-ˈti-lə-\
: 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
Origin of COTYLOSAUR
ultimately from Greek kotylē
First Known Use: 1895
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