We found 17 dictionaries that define the word ball lightning:

General (13 matching dictionaries)

1. ball lightning: Merriam-Webster
2. ball lightning: Oxford Learner's Dictionaries
3. ball lightning: American Heritage Dictionary of the English Language
4. ball lightning: Collins English Dictionary
5. ball lightning: Wordnik
6. ball lightning: Wiktionary
7. ball lightning: The Wordsmyth English Dictionary-Thesaurus
8. ball lightning: Infoplease Dictionary
9. ball lightning: Dictionary.com
10. Ball Lightning (novel), Ball Lightning, Ball lightning: Wikipedia, the Free Encyclopedia
11. ball lightning: FreeDictionary.org
12. ball lightning: TheFreeDictionary.com
13. ball lightning: Merriam-Webster

Computing (1 matching dictionary)

14. ball lightning: Encyclopedia

Miscellaneous (1 matching dictionary)

15. ball lightning: The Skeptic's Dictionary

Slang (1 matching dictionary)

16. ball lightning: Urban Dictionary

Tech (1 matching dictionary)

17. Glossary of Meteorology (No longer online)

Definitions from Wiktionary (ball lightning) ▸ noun:  A short-lived glowing ball sometimes observed to float in the air and thought to consist of ionized gas associated with thunderstorms. Similar: upward lightning, elve, transient luminous event, heat lightning, bluejet, volcanic lightning, sferic, glow discharge, corposant, static electricity, more... Types: plasmball, more... ▸ Words similar to ball lightning ▸ Usage examples for ball lightning ▸ Idioms related to ball lightning ▸ Wikipedia articles (New!) ▸ Words that often appear near ball lightning ▸ Rhymes of ball lightning ▸ Invented words related to ball lightning