(1) Any cold-blooded vertebrate of the class Reptilia including tortoises turtles snakes lizards alligators crocodiles and extinct forms
WiktionaryText
Etymology
Middle English reptil< Old French reptile< rēptile, neuter of reptilis, "creeping" < Latin rēpō "to creep" < PIE *rep-, "to creep, slink" (Pokorny; Watkins, 1969).
