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ARCHOSAUR
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I. (noun)
Sense 1
Meaning:
Extinct reptiles including: dinosaurs; plesiosaurs; pterosaurs; ichthyosaurs; thecodonts
Synonyms:
archosaur; archosaurian; archosaurian reptile
Classified under:
Hypernyms ("archosaur" is a kind of...):
diapsid; diapsid reptile (reptile having a pair of openings in the skull behind each eye)
Hyponyms (each of the following is a kind of "archosaur"):
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)
Holonyms ("archosaur" is a member of...):
Archosauria; subclass Archosauria (a large subclass of diapsid reptiles including: crocodiles; alligators; dinosaurs; pterosaurs; plesiosaurs; ichthyosaurs; thecodonts)
Derivation:
archosaurian (of or relating to reptiles of the subclass Archosauria)
