Permafrost meaning

pûrmə-frôst, -frŏst
Permanently frozen ground, or a specific layer thereof.
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Permanently frozen subsoil, occurring throughout the Polar Regions and locally in perennially frigid areas.
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Permanently frozen soil, subsoil, etc.
noun
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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.
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Origin of permafrost

  • perma(nent) frost

    From American Heritage Dictionary of the English Language, 5th Edition

  • perma- +"Ž frost

    From Wiktionary