We found 13 dictionaries that define the word hearing aids:

General (6 matching dictionaries)

1. hearing aids: Merriam-Webster
2. hearing aids: Collins English Dictionary
3. hearing aids: Cambridge Advanced Learner's Dictionary
4. hearing aids: Wiktionary
5. Hearing aids: Wikipedia, the Free Encyclopedia
6. Hearing Aids: TheFreeDictionary.com

Computing (1 matching dictionary)

7. Hearing Aids: Encyclopedia

Medicine (5 matching dictionaries)

8. hearing aids: Merriam-Webster Medical Dictionary
9. Medical Dictionary (No longer online)
10. Hearing aids: Merck Manuals
11. online medical dictionary (No longer online)
12. Hearing Aids: Medical dictionary

Slang (1 matching dictionary)

13. Hearing-AIDS, hearing AIDS: Urban Dictionary

(Note: See hearing_aid as well.)

Definitions from Wiktionary (hearing aid) ▸ noun:  A device used to help the hard of hearing to hear sounds. ▸ Also see hearing_aid Phrases: History of hearing aids, more... ▸ Words similar to hearing aids ▸ Usage examples for hearing aids ▸ Idioms related to hearing aids ▸ Wikipedia articles (New!) ▸ Words that often appear near hearing aids ▸ Rhymes of hearing aids ▸ Invented words related to hearing aids