archosaur

Science Dictionary
archosaur   (är'kə-sôr')  Pronunciation Key 
Any of various mostly reptilian animals of the subclass Archosauria. Archosaurs are diapsids that began to evolve in the late Permian Period, and are characterized by skulls with long, narrow snouts and teeth set in sockets. Archosaurs include the extinct dinosaurs and pterosaurs and the modern crocodilians and birds.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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