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Definition of permafrost noun from the Oxford Advanced Learner's Dictionary

permafrost

noun
 
/ˈpɜːməfrɒst/
 
/ˈpɜːrməfrɔːst/
[uncountable] (specialist)
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  1. a layer of soil that is permanently frozen, in very cold regions of the world
    Word Origin1940s: from permanent + frost.
See permafrost in the Oxford Advanced American Dictionary
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adjective
 
 
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