First Known Use: 1943
Dictionary
permafrost
noun per·ma·frost \ˈpər-mə-ˌfrȯst\
: a layer of soil that is always frozen in very cold regions of the world
Full Definition of PERMAFROST
: a permanently frozen layer at variable depth below the surface in frigid regions of a planet (as earth)
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Origin of PERMAFROST
permanent + frost
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