noun
permafrost
PUR-muh-frawst
noun
1
Ground that stays frozen solid all year round, typically in polar or high-altitude regions.
"Thawing permafrost is releasing trapped methane in the Arctic."
How to Use Permafrost
Learner’s notesIn plain EnglishSoil or rock that remains frozen throughout the year, common in Arctic and alpine regions.
Common pairings
permafrost thaw
permafrost layer
Word Forms
permafrosts plural
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Thawing _____ is releasing trapped methane in the Arctic.
Etymology
From "perma-" (permanent) + "frost."