9 letters · 11 points in Scrabble
noun any cold-blooded vertebrate of the class Reptilia including tortoises, turtles, snakes, lizards, alligators, crocodiles, and extinct forms
adjective of or relating to the class Reptilia
originFrom reptile + -ian, replacing earlier reptilious and adjectival reptile.
Etymology from Wiktionary, CC BY-SA 3.0