extremophile

/ ɪkˈstrɛməˌfaɪl /

noun

1. a microbe that lives in an environment once thought to be uninhabitable, for example in boiling or frozen water

extremophile

/ ĭk-strē′mə-fīl′ /

1. An organism adapted to living in conditions of extreme temperature, pressure, or chemical concentration, as in highly acidic or salty environments. Many extremophiles are unicellular organisms known as archaea .