permafrost

noun

per·​ma·​frost ˈpər-mə-ˌfrȯst How to pronounce permafrost (audio)
: 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
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
This projection does not factor in tipping points, such as the collapse of the West Antarctic glacier and the thawing of methane-rich Arctic permafrost, that if reached would further destabilize the economy. John Kostyack, Forbes, 15 Oct. 2024 The creek is fed from the pure ice of shrunken glaciers above and ancient permafrost in the ground below. Jon Waterman, Outside Online, 22 Oct. 2024 When the permafrost under airstrips melted, the pavement buckled, and the resulting potholes could damage landing gear. Paul Bierman, Smithsonian Magazine, 19 Sep. 2024 In the fall of 2016, soaring temperatures caused the permafrost encasing a remote Norwegian mountainside to thaw. Ayurella Horn-Muller Syris Valentine, WIRED, 31 Aug. 2024 See all Example Sentences for permafrost 

Word History

Etymology

permanent + frost

First Known Use

1943, in the meaning defined above

Time Traveler
The first known use of permafrost was in 1943

Dictionary Entries Near permafrost

Cite this Entry

“Permafrost.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/permafrost. Accessed 22 Nov. 2024.

Kids Definition

permafrost

noun
per·​ma·​frost ˈpər-mə-ˌfrȯst How to pronounce permafrost (audio)
: a permanently frozen layer at variable depth below the surface in frigid regions of a planet (as earth)

More from Merriam-Webster on permafrost

Last Updated: - Updated example sentences
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!