extremophile

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extremophile

(ĭk-strē′mə-fīl′)
n.
Any of various organisms that require extreme conditions of temperature, pressure, or chemical concentration, as in very cold or salty environments, in order to thrive.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

extremophile

(ĕks-trēm′ŏ-fīl) [L. extremus, outermost, + Gr. philein, to love]
An organism that can thrive in exceptionally adverse environments, such as in very cold or very hot, halogenated, or salty conditions.
Medical Dictionary, © 2009 Farlex and Partners

extremophile

a MICROORGANISM that can grow under severe or extreme environmental conditions; for example, very high temperature, high NaCl concentration, very low pH. Often they are members of the ARCHAEA.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005