Archosaur Definition
 ärkə-sôr 
    noun
  
 Any of various vertebrates of the group Archosauria, having a single opening in each side of the skull in front of the eye socket, and including the dinosaurs, birds, pterosaurs, and modern crocodilians.
 American Heritage 
Any of a subclass (Archosauria) of reptiles, including the dinosaurs, pterosaurs, crocodilians, and thecodonts.
 Webster's New World 
(biology) Any reptile of the taxon Archosauria; includes the extinct dinosaurs, plesiosaurs, pterosaurs and ichthyosaurs and the modern crocodiles.
Wiktionary 
Synonyms: 
  - archosaurian reptile
 - archosaurian
 
Other Word Forms of Archosaur
Noun
Singular:
 archosaurPlural:
 archosaursOrigin of Archosaur
-  
From New Latin Archosauria (“taxonomic division of extinct reptiles"), from ἄρχων (archōn, “leader") + σαύρα (saura, “lizard")
From Wiktionary
 New Latin Archosauria subclass name Greek arkhos ruler Greek sauros lizard
From American Heritage Dictionary of the English Language, 5th Edition
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