co·​ty·​lo·​saur ˈkä-tə-lō-ˌsȯr How to pronounce cotylosaur (audio)
: 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

Word History


ultimately from Greek kotylē + sauros lizard

First Known Use

1895, in the meaning defined above

Time Traveler
The first known use of cotylosaur was in 1895

Dictionary Entries Near cotylosaur

Cite this Entry

“Cotylosaur.” Dictionary, Merriam-Webster, Accessed 3 Dec. 2023.

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