any cold-blooded vertebrate of the class Reptilia including tortoises, turtles, snakes, lizards, alligators, crocodiles, and extinct forms

only extant member of the order Rhynchocephalia of large spiny lizard-like diapsid reptiles of coastal islands off New Zealand

any of various reptiles of the suborder Sauria which includes lizards; in former classifications included also the crocodiles and dinosaurs

extinct reptiles including: dinosaurs; plesiosaurs; pterosaurs; ichthyosaurs; thecodonts

extant archosaurian reptile

limbless scaly elongate reptile; some are venomous