extremophile

/ (ɪkˈstrɛməˌfaɪl) /

noun

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

Scientific definitions for extremophile

extremophile
[ ĭk-strēmə-fīl′ ]

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.