extremophile

World English Dictionary
extremophile (ɪkˈstrɛməˌfaɪl)
 
n
a microbe that lives in an environment once thought to be uninhabitable, for example in boiling or frozen water

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American Heritage
Science Dictionary
extremophile   (ĭk-strēm'ə-fīl')  Pronunciation Key 
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 archea.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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