
An extremophile (from Latin extremus meaning `extreme` and Greek philiā (φιλία) meaning `love`) is an organism that thrives in physically or geochemically extreme conditions that are detrimental to most life on Earth. In contrast, organisms that live in more moderate environments may be termed mesophiles or neutrophiles. ==Characteristic...
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http://en.wikipedia.org/wiki/Extremophile

An organism that requires an extreme enviroment in which to flourish - examples are thermophiles and halophiles.
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Extremophile: An organism that lives under extreme conditions. An example of an extremophile is Methanococcus jannaschii, a microbe that lives near hydrothermal vents deep beneath the sea. The term extremophile was coined late in the 20th century from extreme + -phile, liking = liking extreme (conditions).
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http://www.medterms.com/script/main/art.asp?articlekey=40714
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