1. (n.)reptile any air-breathing vertebrate of the class Reptilia, characterized by a three-chambered heart, a completely bony skeleton, and a covering of dry scales or horny plates: includes the snakes, lizards, turtles, crocodilians, and various extinct forms.
2. reptile (loosely) any of various animals that crawl or creep.
3. reptile a groveling, mean, or despicable person.
4. (adj.)reptile groveling, mean, or despicable.
Etymology: (1350–1400; ME reptil < LL rēptile, n. use of neut. of rēptilis creeping = L rēp(ere) to creep) +-tilis -tile)
Definition of 'reptile'
Princeton's WordNet
1. (noun)reptile, reptilian any cold-blooded vertebrate of the class Reptilia including tortoises, turtles, snakes, lizards, alligators, crocodiles, and extinct forms