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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.

[New Latin Archosauria, subclass name : Greek arkhos, ruler + Greek sauros, lizard.]

ar′cho·saur′i·an n. & adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


belonging to or characteristic of the archosaurs
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.archosaurian - extinct reptiles including: dinosaursarchosaurian - extinct reptiles including: dinosaurs; plesiosaurs; pterosaurs; ichthyosaurs; thecodonts
diapsid, diapsid reptile - reptile having a pair of openings in the skull behind each eye
Archosauria, subclass Archosauria - a large subclass of diapsid reptiles including: crocodiles; alligators; dinosaurs; pterosaurs; plesiosaurs; ichthyosaurs; thecodonts
dinosaur - any of numerous extinct terrestrial reptiles of the Mesozoic era
flying reptile, pterosaur - an extinct reptile of the Jurassic and Cretaceous having a bird-like beak and membranous wings supported by the very long fourth digit of each forelimb
thecodont, thecodont reptile - presumably in the common ancestral line to dinosaurs and crocodiles and birds
ichthyosaur - any of several marine reptiles of the Mesozoic having a body like a porpoise with dorsal and tail fins and paddle-shaped limbs
plesiosaur, plesiosaurus - extinct marine reptile with a small head on a long neck a short tail and four paddle-shaped limbs; of the Jurassic and Cretaceous
nothosaur - extinct marine reptile with longer more slender limbs than plesiosaurs and less completely modified for swimming
Adj.1.archosaurian - of or relating to reptiles of the subclass Archosauriaarchosaurian - of or relating to reptiles of the subclass Archosauria
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in periodicals archive ?
First finding of epsilon-crystallin outside the archosaurian lineage.
The metriorhynchids are a group of Mesozoic marine crocodylomorphs, the only archosaurian group to return secondarily to a pelagic lifestyle.
Archosaurian reptiles from the Evangeline Member comprise various taxa of crocodile-line archosaurs (Pseudosuchia) (Figs.