We found 25 dictionaries that define the word oxygen mask:

General (17 matching dictionaries)

1. oxygen mask: Longman Dictionary of Contemporary English
2. oxygen mask: Merriam-Webster
3. oxygen mask: Oxford Learner's Dictionaries
4. oxygen mask: American Heritage Dictionary of the English Language
5. oxygen mask: Collins English Dictionary
6. oxygen mask: Vocabulary.com
7. oxygen mask: Cambridge Advanced Learner's Dictionary
8. oxygen mask: Wiktionary
9. oxygen mask: Infoplease Dictionary
10. oxygen mask: Dictionary.com
11. Oxygen mask: Wikipedia, the Free Encyclopedia
12. oxygen mask: Rhymezone
13. oxygen mask: FreeDictionary.org
14. oxygen mask: Mnemonic Dictionary
15. oxygen mask: TheFreeDictionary.com

Business (2 matching dictionaries)

16. Travel Industry Dictionary (No longer online)
17. oxygen mask: Legal dictionary

Computing (1 matching dictionary)

18. oxygen mask: Encyclopedia

Medicine (4 matching dictionaries)

19. oxygen mask: Merriam-Webster Medical Dictionary
20. Mask, oxygen, Oxygen mask: MedTerms.com Medical Dictionary
21. oxygen mask: Medical dictionary
22. Mask, oxygen, Oxygen mask: Drug Medical Dictionary

Slang (1 matching dictionary)

23. oxygen mask: Urban Dictionary

(Note: See oxygen_masks as well.)

Definitions from Wiktionary (oxygen mask) ▸ noun:  A plastic or rubber mask through which oxygen may be breathed from a storage tank. Similar: oxygenator, resuscitator, chemical oxygen generator, self-rescuer, loxygen, liquid oxygen, deoxygenator, oxygenation, life support, breathing gas, more... Opposite: carbon dioxide mask, toxic mask, suffocation mask ▸ Words similar to oxygen mask ▸ Usage examples for oxygen mask ▸ Idioms related to oxygen mask ▸ Wikipedia articles (New!) ▸ Words that often appear near oxygen mask ▸ Rhymes of oxygen mask ▸ Invented words related to oxygen mask