We found 28 dictionaries that define the word laughing gas:

General (18 matching dictionaries)

1. laughing gas: Longman Dictionary of Contemporary English
2. laughing gas: Merriam-Webster
3. laughing gas: Oxford Learner's Dictionaries
4. laughing gas: American Heritage Dictionary of the English Language
5. laughing gas: Collins English Dictionary
6. laughing gas: Vocabulary.com
7. laughing-gas, laughing gas: Wordnik
8. laughing gas: Cambridge Advanced Learner's Dictionary
9. laughing-gas, laughing gas: Wiktionary
10. laughing gas: The Wordsmyth English Dictionary-Thesaurus
11. laughing gas: Dictionary.com
12. Laughing Gas (instrumental), Laughing Gas (novel), Laughing gas (disambiguation), Laughing gas: Wikipedia, the Free Encyclopedia
13. laughing gas: Rhymezone
14. laughing gas: FreeDictionary.org
15. laughing gas: Mnemonic Dictionary
16. laughing gas: TheFreeDictionary.com

Business (1 matching dictionary)

17. laughing gas: Legal dictionary

Computing (1 matching dictionary)

18. laughing gas: Encyclopedia

Medicine (6 matching dictionaries)

19. laughing gas: Merriam-Webster Medical Dictionary
20. Gas, laughing, Laughing gas: MedTerms.com Medical Dictionary
21. Laughing gas: Merck Manuals
22. online medical dictionary (No longer online)
23. Gas, laughing, Laughing gas: Drug Medical Dictionary
24. laughing gas: Medical dictionary

Slang (2 matching dictionaries)

25. Laughing gas: Street Terms: Drugs and the Drug Trade
26. laughing gas: Urban Dictionary

Definitions from Wiktionary (laughing gas) ▸ noun:  Nitrous oxide, especially when used as an anaesthetic. Similar: nitrous oxide, gas and air, Entonox, Nevada gas, sevofluran, anesthetization, martini effect, nitro, anesthetic, amyl nitrite, more... Opposite: nitrous oxide, nitrogen oxide, dinitrogen monoxide ▸ Words similar to laughing gas ▸ Usage examples for laughing gas ▸ Idioms related to laughing gas ▸ Wikipedia articles (New!) ▸ Words that often appear near laughing gas ▸ Rhymes of laughing gas ▸ Invented words related to laughing gas