follow Dictionary.com

How Well Do You Know English Slang?

permafrost

[pur-muh-frawst, -frost] /ˈpɜr məˌfrɔst, -ˌfrɒst/
noun
1.
(in arctic or subarctic regions) perennially frozen subsoil.
Also called pergelisol.
Origin
1943
1943; perma(nent) + frost
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source
Examples for permafrost
  • It is the largest river in the world that is completely underlain by permafrost.
  • They show a surface broken into polygonal slabs by repeated freezing and thawing of the sort that happens above permafrost.
  • Vast reaches of the planet have been locked for millennia in stunning permafrost formations.
  • Thawing permafrost may soak up greenhouse gas before it begins to spew it out.
  • However, seasons are well defined and permafrost hides here on north-facing slopes and in sheltered hollows.
  • Research has begun to find the best way to unlock the energy potential of hydrates under permafrost.
  • The rest is thought to be underground as permafrost.
  • In this tough climate, bare bedrock is common, and permafrost lies beneath the rest of the area.
  • Nuclear explosions underground could quickly melt the deep permafrost.
  • Around one-fifth of the world's land area lies within the permafrost zone.
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
Cite This Source
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
Cite This Source
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.
Cite This Source

Word of the Day

Difficulty index for permafrost

Most English speakers likely know this word

Word Value for permafrost

17
0
Scrabble Words With Friends