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Definition of reptile noun from the Oxford Advanced Learner's Dictionary

reptile

noun
reptile pronunciation English ˈreptaɪl reptile pronunciation American ˈreptaɪl reptile pronunciation American ˈreptl
 
any animal that has cold blood and skin covered in scales, and that lays eggs. Snakes, crocodiles and tortoises are all reptiles.
compare amphibianreptilian
reptilian pronunciation English repˈtɪliən reptilian pronunciation American repˈtɪliən
adjectiveour reptilian ancestors (figurative) He licked his lips in an unpleasantly reptilian way.