reptile Definition

an animal that crawls or moves on its belly (such as a snake) or on small short legs (such as a lizard)

any of a class (Reptilia) of cold-blooded, air-breathing, usually egg-laying vertebrates that include the alligators and crocodiles, lizards, snakes, turtles, and extinct related forms (such as dinosaurs and pterosaurs) and that have a body typically covered with scales or bony plates and a bony skeleton with a single occipital condyle, a distinct quadrate bone usually immovably articulated with the skull, and ribs attached to the sternum

a groveling or despised person

characteristic of a reptile : reptilian