Dictionary

permafrost

noun per·ma·frost \ˈpər-mə-ˌfrst\

: 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)

Origin of PERMAFROST

permanent + frost
First Known Use: 1943

Rhymes with PERMAFROST

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