Reptilian

Part of speech: noun (n.)

One of the Reptilia; a reptile.

Part of speech: adjective (a.)

Belonging to the reptiles. 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.