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extrasolar
extrasystole
extraterrestrial
extraterritorial
extraterritoriality
extrauterine
extravagance
extravagant
extravaganza
extravasate
extravascular
extravehicular
extravehicular activity
extraversion
extravert
extreme
Extreme Games
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extremophile

ex·trem·o·phile [ ik strm ə fl ]


noun 
Definition:
 
organism that lives in extreme environment: an organism, especially a microorganism, that thrives in climatic or environmental extremes such as the intense heat of a boiling sulfur pool or the intense cold of Arctic permafrost

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