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permafrost

noun [U]
 
 
/ˈpɜː.mə.frɒst/ US  /ˈpɝː.mə.frɑːst/ specialized

Definition

an area of land that is permanently frozen below the surfaceSnow and iceCold
(Definition of permafrost noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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