any reptile of the subclass Archosauria, including the dinosaurs, pterosaurs, and crocodilians and characterized by two pairs of openings in the temporal region of the skull.

1965–70; < Neo-Latin Archosaurus, taken as singular of Archosauria, equivalent to Greek archo-, combining form of archós ruler, chief + saûr(os) -saur + Neo-Latin -ia -ia

archosaurian, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
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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Example sentences
After three decades of waiting, a roughly three-foot-long archosaur has been named as a new species.
There are current research projects involving this archosaur in order to better establish its position.
To date no evidence has ever been found of a venomous archosaur.
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