| Noun | 1. | subclass Lepidosauria - diapsid reptiles: lizards; snakes; tuataras 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 order Rhynchocephalia, Rhynchocephalia - tuataras; extinct forms from middle Triassic order Squamata, Squamata - diapsid reptiles: snakes and lizards class - (biology) a taxonomic group containing one or more orders |