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permafrost

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noun per·ma·frost \ˈpər-mə-ˌfrȯst\

Simple Definition of permafrost

  • : a layer of soil that is always frozen in very cold regions of the world

Full Definition of permafrost

  1. :  a permanently frozen layer at variable depth below the surface in frigid regions of a planet (as earth)

Origin of permafrost

permanent + frost


First Known Use: 1943

Rhymes with permafrost


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