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
Origin and Etymology of pterosaur
New Latin Pterosauria, from Greek pteron wing + sauros lizard
First Known Use: 1863
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