permafrost
noun
per·ma·frost
ˈpər-mə-ˌfrȯst 
: 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
And as the permafrost thaws, the tundra of the Arctic biome is shrinking, and the boreal forest biome is creeping northward, disrupting ecosystems.
—
Andrea Thompson, Scientific American, 16 Dec. 2025
Permafrost thaw is turning rivers orange As permafrost – the frozen ground that underlies much of the Arctic – continues its long-term warming and thaw, one emerging consequence is the spread of rusting rivers.
—Matthew L. Druckenmiller, The Conversation, 16 Dec. 2025
Koch said that the thawing of long-frozen ground known as permafrost is likely triggering the discoloration.
—Barbara Moran, NPR, 16 Dec. 2025
This extreme environment, characterized by freezing temperatures, strong winds, and permafrost, makes traditional manual labor intensely hazardous and brutally inefficient.
—Mrigakshi Dixit, Interesting Engineering, 8 Dec. 2025
See All Example Sentences for permafrost
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.
Andrea Thompson, Scientific American, 16 Dec. 2025
Permafrost thaw is turning rivers orange As permafrost – the frozen ground that underlies much of the Arctic – continues its long-term warming and thaw, one emerging consequence is the spread of rusting rivers.
—Matthew L. Druckenmiller, The Conversation, 16 Dec. 2025
Koch said that the thawing of long-frozen ground known as permafrost is likely triggering the discoloration.
—Barbara Moran, NPR, 16 Dec. 2025
This extreme environment, characterized by freezing temperatures, strong winds, and permafrost, makes traditional manual labor intensely hazardous and brutally inefficient.
—Mrigakshi Dixit, Interesting Engineering, 8 Dec. 2025
See All Example Sentences for permafrost
Cite this Entry
“Permafrost.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/permafrost. Accessed 26 Dec. 2025.
Copy CitationKids Definition
permafrost
noun
per·ma·frost
ˈpər-mə-ˌfrȯst
: a permanently frozen layer at variable depth below the surface in frigid regions of a planet (as earth)
Love words? Need even more definitions?
Merriam-Webster unabridged
Share