Definition of permafrost
: a permanently frozen layer at variable depth below the surface in frigid regions of a planet (such as earth)
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Recent Examples of permafrost from the Web
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The Post’s Chris Mooney reports there are 32 million gallons of mercury trapped in the permafrost.
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Browsing satellite photos of the Uyuk River valley, Swiss archaeologist Gino Caspari first spotted the circular structure deep in the Siberian permafrost on his computer screen.
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The Scandinavian country announced on Monday the new investment, after melting permafrost caused by unseasonably warm temperatures risked flooding the vault last year.
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The scientists performed the research by taking cores from permafrost across Alaska.
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Sea level rise and melting permafrost have resulted in damages to roads, utility infrastructure, seawalls and runways at several Air Force radar installations in Alaska, according to the report.
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One of those is the release of greenhouse gas from thawing permafrost—and regions of shallow seafloor that were frozen land thousands of years ago when sea level was much lower.
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The proposal stems from flooding at the entrance from an unexpected thaw in the permafrost, though none of the seed stocks were affected.
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First, there's a heating element that prevents the cold from the ice sheet from transferring to and creating permafrost in the ground underneath.
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'permafrost.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
Origin and Etymology of permafrost
permanent + frost
PERMAFROST Defined for English Language Learners
Definition of permafrost for English Language Learners
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: a layer of soil that is always frozen in very cold regions of the world
Learn More about permafrost
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See words that rhyme with permafrost Britannica.com: Encyclopedia article about permafrost
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