any cold-blooded vertebrate of the class Reptilia including tortoises turtles snakes lizards alligators crocodiles and extinct forms
You can also use the word reptilian to describe something that is characteristic of a reptile or that is like a reptile. The chick is ugly and almost reptilian in its appearance
{i} reptile, cold-blooded animal from the class Reptilia (such as snakes, lizards, etc.)