We found 29 dictionaries that define the word first aid:

General (20 matching dictionaries)

1. first aid: Merriam-Webster
2. first aid: Oxford Learner's Dictionaries
3. first aid: American Heritage Dictionary of the English Language
4. first aid: Collins English Dictionary
5. first aid: Vocabulary.com
6. First-Aid, First-aid, first-aid, first aid: Wordnik
7. first aid: Cambridge Advanced Learner's Dictionary
8. first-aid, first aid: Wiktionary
9. first aid: The Wordsmyth English Dictionary-Thesaurus
10. first aid: Infoplease Dictionary
11. first-aid, first aid: Dictionary.com
12. First Aid (Transformers), First Aid, First-aid, First aid (disambiguation), First aid: Wikipedia, the Free Encyclopedia
13. first aid: Rhymezone
14. first aid: AllWords.com Multi-Lingual Dictionary
15. first aid: FreeDictionary.org
16. first aid: Mnemonic Dictionary
17. first-aid, first aid: TheFreeDictionary.com
18. first aid: Longman Dictionary of Contemporary English

Business (1 matching dictionary)

19. first aid: Legal dictionary

Computing (1 matching dictionary)

20. first-aid, first aid: Encyclopedia

Medicine (5 matching dictionaries)

21. first aid: Merriam-Webster Medical Dictionary
22. Dorland's Illustrated Medical Dictionary (No longer online)
23. First aid: Merck Manuals
24. online medical dictionary (No longer online)
25. first-aid, first aid: Medical dictionary

Slang (1 matching dictionary)

26. first aid: Urban Dictionary

Tech (1 matching dictionary)

27. Glossary of Coal Mining Terms (No longer online)

(Note: See first_aids as well.)

Definitions from Wiktionary (first aid) ▸ noun:  (medicine) Basic medical care given to an injury victim, usually where the injury is slight or where better care is not available. Similar: primary care, forecare, primary healthcare, base, preventative medicine, golden hour, premed, first responder, primary, preparation, more... Types: bandage, gauze, antiseptic, disinfectant, pain reliever, stretcher, cast, more... Phrases: first aid kit, first aid station, first aid kits, First Aid Nursing Yeomanry, Mental health first aid, more... Adjectives: warish, cicatrizant, processed, physic, camphorate, loco, sinecure, plus, autoclave, enriching, curative ▸ Words similar to first aid ▸ Usage examples for first aid ▸ Idioms related to first aid ▸ Wikipedia articles (New!) ▸ Words that often appear near first aid ▸ Rhymes of first aid ▸ Invented words related to first aid