noun ptero·saur \ˈter-ə-ˌsr\

Definition of PTEROSAUR

:  any of an order (Pterosauria) of extinct flying reptiles existing from the Late Triassic throughout the Jurassic and most of the Cretaceous and having a featherless wing membrane extending from the side of the body along the arm to the end of the greatly elongated fourth digit


New Latin Pterosauria, from Greek pteron wing + sauros lizard
First Known Use: 1862


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