(n) 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, Syn.class Reptilia
‖n. pl. [ NL. ] (Zool.) A class of air-breathing oviparous vertebrates, usually covered with scales or bony plates. The heart generally has two auricles and one ventricle. The development of the young is the same as that of birds. [ 1913 Webster ]
☞ It is nearly related in many respects to Aves, or birds. The principal existing orders are Testidunata or Chelonia (turtles), Crocodilia, Lacertilla (lizards), Ophidia (serpents), and Rhynchocephala; the chief extinct orders are Dinosauria, Theremorpha, Mosasauria, Pterosauria, Plesiosauria, Ichtyosauria. [ 1913 Webster ]
Reptilian age (Geol.), that part of geological time comprising the Triassic, Jurassic, and Cretaceous periods, and distinguished as that era in which the class of reptiles attained its highest expansion; -- called also the Secondary or Mezozoic age. [ 1913 Webster ]
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