rep ‧ tile /ˈreptaɪl $ ˈreptl/ BrE AmE noun [countable]
[ Date: 1300-1400 ; Language: Old French ; Origin: Late Latin reptilis 'creeping' , from Latin repere 'to creep' ]
1 . a type of animal, such as a snake or ↑ lizard , whose body temperature changes according to the temperature around it, and that usually lays eggs to have babies
2 . informal someone who is unpleasant or cannot be trusted
—reptilian /repˈtɪliən/ adjective