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|Noun||1.||Archosauria - a large subclass of diapsid reptiles including: crocodiles; alligators; dinosaurs; pterosaurs; plesiosaurs; ichthyosaurs; thecodonts|
class Reptilia, Reptilia - class of cold-blooded air-breathing vertebrates with completely ossified skeleton and a body usually covered with scales or horny plates; once the dominant land animals
archosaur, archosaurian, archosaurian reptile - extinct reptiles including: dinosaurs; plesiosaurs; pterosaurs; ichthyosaurs; thecodonts
Crocodilia, Crocodylia, order Crocodilia, order Crocodylia - crocodiles; alligators; caimans; gavials
order Ornithischia, Ornithischia - extinct terrestrial reptiles having bird-like pelvises: armored dinosaurs (thyreophorans); boneheaded and horned dinosaurs (marginocephalians); duck-billed dinosaurs (euronithopods)
order Saurischia, Saurischia - extinct terrestrial reptiles: theropods (carnivorous); sauropods (herbivorous)
order Thecodontia, Thecodontia - extinct terrestrial reptiles having teeth set in sockets; of the late Permian to Triassic
class - (biology) a taxonomic group containing one or more orders
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