permafrost

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(pʉr′mə frôst′)

noun

permanently frozen soil, subsoil, etc.

Origin: perma(nent) + frost

See permafrost in American Heritage Dictionary 4

noun
Permanently frozen subsoil, occurring throughout the Polar Regions and locally in perennially frigid areas.

Origin:

Origin: perma(nent)

Origin: + frost

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