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Definition of permafrost - 4 dictionary results
per⋅ma⋅frost
[pur-muh-frawst, -frost] 
məˌfrɔst
–noun
| (in arctic or subarctic regions) perennially frozen subsoil. |
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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Based on the Random House Dictionary, © Random House, Inc. 2009.
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Link To permafrost
| per·ma·frost (pûr'mə-frôst', -frŏst') n. Permanently frozen subsoil, occurring throughout the Polar Regions and locally in perennially frigid areas. [perma(nent) + frost.] |
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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permafrost
1943, coined in Eng. by S.W. Muller from perm(anent) frost.
Online Etymology Dictionary, © 2001 Douglas Harper
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| permafrost (pûr'mə-frôst') Pronunciation Key
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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Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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