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[pur-muh-frawst, -frost] /ˈpɜr məˌfrɔst, -ˌfrɒst/

(in arctic or subarctic regions) perennially frozen subsoil.
ground that is permanently frozen, often to great depths, the surface sometimes thawing in the summer

1943, coined in English by Russian-born U.S. geologist Siemon W. Muller (1900-1970) from perm(anent) frost.
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.


Read Also:

  • Permafrost-table

    noun 1. the variable surface constituting the upper limit of permafrost. Compare (def 2).

  • Permalancer

    noun a permanent freelance worker Word Origin perma(nent) + (free)lancer Usage Note informal

  • Permalink

    [pur-muh-lingk] /ˈpɜr məˌlɪŋk/ noun, Digital Technology. 1. a permanent URL that links to a specific Web page, typically a single blog entry or news article. /ˈpɜːməˌlɪŋk/ noun 1. an internet hyperlink that is intended to be permanent

  • Permalloy

    [purm-al-oi, pur-muh-loi] /ˌpɜrmˈæl ɔɪ, ˈpɜr məˌlɔɪ/ Trademark. 1. a brand name for any of a class of alloys of high magnetic permeability, containing from 30 to 90 percent nickel. /pɜːmˈælɔɪ/ noun 1. any of various alloys containing iron and nickel (45–80 per cent) and sometimes smaller amounts of chromium and molybdenum

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