noun
(informal) Any member of the class Reptilia that is not a bird— a cold-blooded vertebrate with dry scales that usually lays eggs, such as a lizard, snake, turtle, tortoise, crocodile, alligator, etc.
(zoology, cladistic) Any member of Reptilia, including birds.
(loosely, historical) A reptile or amphibian.
(figuratively, dated) A mean, grovelling, loathsome or repulsive person.
adjective
Creeping; moving on the belly, or by means of small and short legs.
Grovelling; low; vulgar.