We found 31 dictionaries that define the word hearing aid:

General (19 matching dictionaries)

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

Business (2 matching dictionaries)

18. hearing aid: Legal dictionary
19. hearing aid: Financial dictionary

Computing (1 matching dictionary)

20. hearing aid: Encyclopedia

Medicine (8 matching dictionaries)

21. hearing aid: Merriam-Webster Medical Dictionary
22. Dorland's Illustrated Medical Dictionary (No longer online)
23. Hearing aid: MedTerms.com Medical Dictionary
24. online medical dictionary (No longer online)
25. Health and Wellness Dictionary (No longer online)
26. hearing aid: Medical dictionary
27. Hearing aid: Drug Medical Dictionary
28. Hyperdictionary (No longer online)

Slang (1 matching dictionary)

29. Hearing Aid: Urban Dictionary

(Note: See hearing_aids as well.)

Definitions from Wiktionary (hearing aid) ▸ noun:  A device used to help the hard of hearing to hear sounds. Similar: ear trumpet, deaf-aid, hearing loop, headphones, earphone, earhorn, hi-fi, hearin', hr'g, heat detector, more... Types: in ear, behind ear, receiver in canal, receiver in ear, more... Phrases: behind-the-ear hearing aid, behind the ear hearing aid, digital hearing aid, eyeglass model hearing aid, Bone-anchored hearing aid, more... Adjectives: vibrating, sirenlike, vibratory, dotted, dotty, vibrative, ringed, minikin, fingery, ditsy, pencilled ▸ Words similar to hearing aid ▸ Usage examples for hearing aid ▸ Idioms related to hearing aid ▸ Wikipedia articles (New!) ▸ Words that often appear near hearing aid ▸ Rhymes of hearing aid ▸ Invented words related to hearing aid