We found 35 dictionaries that define the word thunderstorm:

General (24 matching dictionaries)

1. thunderstorm: Longman Dictionary of Contemporary English
2. thunderstorm: Merriam-Webster
3. thunderstorm: Oxford Learner's Dictionaries
4. thunderstorm: American Heritage Dictionary of the English Language
5. thunderstorm: Collins English Dictionary
6. thunderstorm: Vocabulary.com
7. Thunderstorm, thunderstorm: Wordnik
8. thunderstorm: Cambridge Advanced Learner's Dictionary
9. thunderstorm: Wiktionary
10. thunderstorm: Webster's New World College Dictionary, 4th Ed.
11. thunderstorm: The Wordsmyth English Dictionary-Thesaurus
12. thunderstorm: Infoplease Dictionary
13. thunderstorm: Dictionary.com
14. thunderstorm: Cambridge Essential American English Dictionary
15. The Thunderstorm, Thunderstorm (band), Thunderstorm (film), Thunderstorm (opera), Thunderstorm (play), Thunderstorm: Wikipedia, the Free Encyclopedia
16. Thunderstorm: Online Plain Text English Dictionary
17. thunderstorm: Webster's Revised Unabridged, 1913 Edition
18. thunderstorm: Rhymezone
19. Thunderstorm: AllWords.com Multi-Lingual Dictionary
20. thunderstorm: FreeDictionary.org
21. thunderstorm: Mnemonic Dictionary
22. thunderstorm: TheFreeDictionary.com

Computing (1 matching dictionary)

23. thunderstorm: Encyclopedia

Medicine (1 matching dictionary)

24. thunderstorm: Medical dictionary

Miscellaneous (1 matching dictionary)

25. Encyclopedia of Graphic Symbols (No longer online)

Science (3 matching dictionaries)

26. thunderstorm: LITTLE EXPLORERS(TM) Picture Dictionary
27. From Stargazers to Starships Glossary (No longer online)
28. Weather Glossary (No longer online)

Slang (1 matching dictionary)

29. thunderstorm: Urban Dictionary

Tech (4 matching dictionaries)

30. Glossary of Meteorology (No longer online)
31. Explosives (No longer online)
32. Lake and Water Word Glossary (No longer online)
33. National Weather Service Glossary (No longer online)

(Note: See thunderstorming as well.)

Definitions from Wiktionary ( ) ▸ noun:  A storm consisting of thunder and lightning produced by a cumulonimbus, usually accompanied with heavy rain, wind, and sometimes hail; and in rarer cases sleet, freezing rain, or snow. Similar: electrical storm, electric storm, thunder and lightning, thundershower, lightning storm, tempest, storm, thunderbolt, cloudburst, thunder, more... Opposite: clear skies, sunshine, fair weather Types: single-cell, multi-cell, supercell, squall line, more... Phrases: severe thunderstorm, thunderstorm cell, supercell thunderstorm, air mass thunderstorm, thunderstorm asthma, more... Adjectives: violent, heavy, severe, terrific, sudden, terrible, tremendous, great, big, fierce, tropical Colors:     charcoal,     slate gray,     midnight blue,     graphite,     ash gray, more... ▸ Words similar to thunderstorm ▸ Usage examples for thunderstorm ▸ Idioms related to thunderstorm ▸ Wikipedia articles (New!) ▸ Popular adjectives describing thunderstorm ▸ Words that often appear near thunderstorm ▸ Rhymes of thunderstorm ▸ Invented words related to thunderstorm