permafrost: meaning, definition, pronunciation and examples
Low-frequency, specializedTechnical/scientific, academic, environmental discourse
Quick answer
What does “permafrost” mean?
A thick subsurface layer of soil or rock that remains frozen throughout the year, occurring chiefly in polar regions.
Audio
Pronunciation
Definition
Meaning and Definition
A thick subsurface layer of soil or rock that remains frozen throughout the year, occurring chiefly in polar regions.
Any ground that remains completely frozen (0°C or below) for at least two consecutive years; also used metaphorically to describe something that is rigidly fixed or unchanging.
Dialectal Variation
British vs American Usage
Differences
No significant lexical differences. Both use the same term. Spelling is identical.
Connotations
Identical technical connotations. In non-scientific contexts, metaphorical use might be slightly more common in UK environmental/political commentary.
Frequency
Equally low-frequency in both dialects, confined to specific contexts (climatology, geology, environmental science).
Grammar
How to Use “permafrost” in a Sentence
Noun + verb (permafrost melts/thaws/contains)Adjective + permafrost (ancient/deep/melting permafrost)Preposition + permafrost (in/within/under the permafrost)Vocabulary
Collocations
Examples
Examples of “permafrost” in a Sentence
verb
British English
- The area is beginning to permafrost again after a warm period. (rare, non-standard)
American English
- The ground did not permafrost properly that winter. (rare, non-standard)
adverb
British English
- (No standard adverbial form exists.)
American English
- (No standard adverbial form exists.)
adjective
British English
- The permafrost layer is several hundred metres thick. (attributive noun use)
American English
- They studied permafrost dynamics in Alaska. (attributive noun use)
Usage
Meaning in Context
Business
Rare. Might appear in reports on Arctic infrastructure, oil/gas extraction, or climate risk assessment.
Academic
Common in geology, physical geography, climatology, and environmental science papers.
Everyday
Very rare. Might appear in news reports about climate change in polar regions.
Technical
Core term in geocryology, soil science, and climate modelling. Precise definitions matter (e.g., temperature/duration criteria).
Vocabulary
Synonyms of “permafrost”
Vocabulary
Antonyms of “permafrost”
Watch out
Common Mistakes When Using “permafrost”
- Using 'permafrost' to refer to seasonal frost or surface ice. Confusing it with glaciers or ice sheets. Misspelling as 'permafrost' (one word, not hyphenated).
FAQ
Frequently Asked Questions
No. Permafrost is frozen ground (soil, rock, sediment). A glacier is a persistent body of dense ice that moves under its own weight.
Yes, but the process is typically called 'thawing'. When permafrost thaws, the ice within it melts, causing the ground to become unstable.
Primarily in polar regions (Arctic, Antarctica) and high-altitude areas like the Tibetan Plateau and the Alps. Large expanses exist in Siberia, northern Canada, and Alaska.
It releases large amounts of trapped greenhouse gases (methane and carbon dioxide), accelerates global warming, and destabilises the ground, damaging buildings, roads, and pipelines.
A thick subsurface layer of soil or rock that remains frozen throughout the year, occurring chiefly in polar regions.
Permafrost is usually technical/scientific, academic, environmental discourse in register.
Permafrost: in British English it is pronounced /ˈpɜːməfrɒst/, and in American English it is pronounced /ˈpɜːrməfrɔːst/. Tap the audio buttons above to hear it.
Phrases
Idioms & Phrases
- “political permafrost (metaphorical: rigid, unchanging ideology or system)”
Learning
Memory Aids
Mnemonic
PERMA-nently FROST-ed ground. Think of PERMAnent FROST.
Conceptual Metaphor
IMMOBILITY IS FROZEN GROUND (e.g., 'The bureaucratic permafrost prevented any reform.'); CLIMATE CHANGE IS THAWING (e.g., 'Thawing permafrost releases ancient methane.').
Practice
Quiz
What is the primary characteristic of permafrost?