We found 16 dictionaries that define the word water gun:

General (13 matching dictionaries)

1. water gun: Merriam-Webster
2. water gun: Oxford Learner's Dictionaries
3. water gun: American Heritage Dictionary of the English Language
4. water gun: Collins English Dictionary
5. water gun: Vocabulary.com
6. water gun: Wiktionary
7. water gun: The Wordsmyth English Dictionary-Thesaurus
8. water gun: Dictionary.com
9. Water gun: Wikipedia, the Free Encyclopedia
10. water gun: Rhymezone
11. water gun: FreeDictionary.org
12. water gun: Mnemonic Dictionary
13. water gun: TheFreeDictionary.com

Computing (1 matching dictionary)

14. water gun: Encyclopedia

Slang (1 matching dictionary)

15. water gun: Urban Dictionary

Tech (1 matching dictionary)

16. Schlumberger Oilfield Glossary (No longer online)

(Note: See water_guns as well.)

Definitions from Wiktionary (water gun) ▸ noun:  A toy gun used to shoot water. Similar: water pistol, squirt gun, Super Soaker, pen gun, drop gun, water balloon, zip gun, pop gun, cap gun, spring gun, more... Opposite: dry gun, air gun, powder gun, non-water gun ▸ Words similar to water gun ▸ Usage examples for water gun ▸ Idioms related to water gun ▸ Wikipedia articles (New!) ▸ Words that often appear near water gun ▸ Rhymes of water gun ▸ Invented words related to water gun