Definition of archosaur
: any of a subclass (Archosauria) of reptiles comprising the dinosaurs, pterosaurs, and crocodilians
archosaurianplay \ˌär-kə-ˈsȯr-ē-ən\ adjective or noun
Origin and Etymology of archosaur
New Latin Archosauria, from Greek archōn + sauros lizard
First Known Use: 1933
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