per·​ma·​frost | \ ˈpər-mə-ˌfrȯst How to pronounce permafrost (audio) \

Definition of permafrost

: a permanently frozen layer at variable depth below the surface in frigid regions of a planet (such as earth)

Examples of permafrost in a Sentence

Recent Examples on the Web The state’s permafrost prevents water from draining, which means the Arctic is full of small pools, where mosquitoes live as larvae. Morgan Krakow, Anchorage Daily News, 2 May 2022 That’s always been an issue for maintaining roads through permafrost. Michelle Theriault Boots, Anchorage Daily News, 16 Apr. 2022 The new study outlines several new sinkholes in the Arctic seafloor’s ancient permafrost. Joshua Hawkins, BGR, 30 Mar. 2022 A few feet below its surface, much of the soil is frozen permafrost, but the top layer blooms with grasses and low shrubs during the short summer months. Donatella Zona, The Conversation, 29 Mar. 2022 On land, permafrost is thawing because temperatures are rising. Matt Simon, Wired, 21 Mar. 2022 In the far north, wildfires have become more common, fish stocks have moved, and permafrost has thawed beneath roads, buildings and pipelines — causing buckling and destruction. Los Angeles Times, 7 Mar. 2022 The area also provides the company with some of the world’s best mineral deposits, which are mined up to 5,000 feet below the permafrost. Alistair Macdonald, WSJ, 6 Mar. 2022 This can change how organic matter decomposes and degrade the permafrost, per the Guardian. Elizabeth Gamillo, Smithsonian Magazine, 18 Feb. 2022 See More

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.

First Known Use of permafrost

1943, in the meaning defined above

History and Etymology for permafrost

permanent + frost

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Time Traveler for permafrost

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The first known use of permafrost was in 1943

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Last Updated

9 May 2022

Cite this Entry

“Permafrost.” Dictionary, Merriam-Webster, Accessed 18 May. 2022.

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