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
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The now extinct pterosaurs had them, as do bats and birds that are still alive today.
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Origin and Etymology of pterosaur
New Latin Pterosauria, from Greek pteron wing + sauros lizard
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See words that rhyme with pterosaur Britannica.com: Encyclopedia article about pterosaur
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