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permafrost

[pur-muh-frawst, -frost] /ˈpɜr məˌfrɔst, -ˌfrɒst/
noun
1.
(in arctic or subarctic regions) perennially frozen subsoil.
Also called pergelisol.
Origin of permafrost
1943
1943; perma(nent) + frost
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Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for permafrost

permafrost

/ˈpɜːməˌfrɒst/
noun
1.
ground that is permanently frozen, often to great depths, the surface sometimes thawing in the summer
Word Origin
C20: from perma(nent) + frost
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for permafrost
n.

1943, coined in English by Russian-born U.S. geologist Siemon W. Muller (1900-1970) from perm(anent) frost.

Online Etymology Dictionary, © 2010 Douglas Harper
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permafrost in Science
permafrost
  (pûr'mə-frôst')   
A layer of soil or bedrock that has been continuously frozen for at least two years and as long as tens of thousands of years. Permafrost can reach depths of up to 1,524 m (4,999 ft). It is found throughout most of the polar regions and underlies about one fifth of the Earth's land surface.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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