archosaur definition by American Heritage Dictionary
The American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
A reptile of the subclass Archosauria, which includes the dinosaurs, pterosaurs, and the modern crocodilians.
Origin: New Latin Archosauria, subclass name : Greek arkhos, ruler + Greek sauros, lizard.
archosaur - Science Definition
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.