Permafrost Definition

pûrmə-frôst, -frŏst
noun
Permanently frozen soil, subsoil, etc.
Webster's New World
other
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.
American Heritage Science

Other Word Forms of Permafrost

Noun

Singular:
permafrost
Plural:
permafrosts

Origin of Permafrost

  • perma(nent) frost

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

  • perma- +"Ž frost

    From Wiktionary

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