We found 34 dictionaries that define the word permafrost:

General (21 matching dictionaries)

1. permafrost: Longman Dictionary of Contemporary English
2. permafrost: Merriam-Webster
3. permafrost: Oxford Learner's Dictionaries
4. permafrost: American Heritage Dictionary of the English Language
5. permafrost: Collins English Dictionary
6. permafrost: Vocabulary.com
7. Permafrost, permafrost: Wordnik
8. permafrost: Cambridge Advanced Learner's Dictionary
9. permafrost: Wiktionary
10. permafrost: Webster's New World College Dictionary, 4th Ed.
11. permafrost: The Wordsmyth English Dictionary-Thesaurus
12. permafrost: Infoplease Dictionary
13. permafrost: Dictionary.com
14. permafrost: Online Etymology Dictionary
15. Permafrost (album), Permafrost (disambiguation), Permafrost (newspaper), Permafrost (story), Permafrost: Wikipedia, the Free Encyclopedia
16. permafrost: Rhymezone
17. permafrost: FreeDictionary.org
18. permafrost: Mnemonic Dictionary
19. permafrost: TheFreeDictionary.com

Business (1 matching dictionary)

20. Construction Term Glossary (No longer online)

Computing (1 matching dictionary)

21. permafrost: Encyclopedia

Science (4 matching dictionaries)

22. Archaeology Wordsmith (No longer online)
23. Botanical Terms (No longer online)
24. Illustrated Glossary of Geologic Terms (No longer online)
25. Atmospheric Chemistry and Air Quality (No longer online)

Slang (1 matching dictionary)

26. permafrost: Urban Dictionary

Tech (6 matching dictionaries)

27. DOD Dictionary of Military Terms (No longer online)
28. Glossary of Meteorology (No longer online)
29. permafrost: Canadian Soil Information System
30. Lake and Water Word Glossary (No longer online)
31. National Weather Service Glossary (No longer online)
32. Schlumberger Oilfield Glossary (No longer online)

(Note: See permafrosting as well.)

Definitions from Wiktionary ( ) ▸ noun:  Permanently frozen ground, or a specific layer thereof. Similar: superfrost, talik, gelisol, lithalsa, ground frost, periglaciation, frost line, cryosphere, subglacial lake, slush, more... Opposite: thaw Types: continuous, discontinuous, stratified, frozen soil, frozen ground, frozen subsoil, more... Phrases: continuous permafrost, discontinuous permafrost, permafrost table, permafrost soil, beyond the permafrost, more... Adjectives: continuous, discontinuous, rich, siberian, sporadic, alpine, deep, warm, thick, relict, bonded Colors:     ice blue,     glacier white,     arctic silver,     polar blue,     frozen teal, more... ▸ Word origin ▸ Words similar to permafrost ▸ Usage examples for permafrost ▸ Idioms related to permafrost ▸ Wikipedia articles (New!) ▸ Popular adjectives describing permafrost ▸ Words that often appear near permafrost ▸ Rhymes of permafrost ▸ Invented words related to permafrost