REPTILIAN /ɹepˈtɪliən/ Scrabble 11 Words With Friends 14 Definition adjective of or relating to the class Reptilia. noun any cold-blooded vertebrate of the class Reptilia including tortoises, turtles, snakes, lizards, alligators, crocodiles, and extinct forms. — synonyms: reptile See all 373 words you can make from REPTILIAN → 9-letter words Words starting with R Words ending with N ← Unscramble different letters