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Any of various organisms, such as certain bacteria and archaea, requiring temperatures of 80°C (176°F) or higher to thrive.
hy′per·ther′mo·phil′ic (-fĭl′ĭk) adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Biology) an organism, esp a bacterium, that lives at high temperatures (above 80°C), found in some hot springs
[C20: from hyper- + -thermophile]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014