We found 19 dictionaries that define the word allergic reaction:

General (7 matching dictionaries)

1. allergic reaction: Vocabulary.com
2. allergic reaction: Dictionary.com
3. Allergic reaction: Wikipedia, the Free Encyclopedia
4. allergic reaction: Rhymezone
5. allergic reaction: FreeDictionary.org
6. allergic reaction: Mnemonic Dictionary
7. allergic reaction: TheFreeDictionary.com

Business (3 matching dictionaries)

8. allergic reaction: Legal dictionary
9. allergic reaction: Financial dictionary
10. BusinessDictionary.com (No longer online)

Computing (1 matching dictionary)

11. allergic reaction: Encyclopedia

Medicine (8 matching dictionaries)

12. Dorland's Illustrated Medical Dictionary (No longer online)
13. Allergic reaction, Reaction, allergic: MedTerms.com Medical Dictionary
14. online medical dictionary (No longer online)
15. Lay Terms for Consent Forms (No longer online)
16. Hepatitis C Information Central (No longer online)
17. allergic reaction: Medical dictionary
18. Allergic reaction, Reaction, allergic: Drug Medical Dictionary
19. Hyperdictionary (No longer online)

(Note: See allergic_reactions as well.)

Definitions from WordNet (allergic reaction) ▸ noun:  hypersensitivity reaction to a particular allergen; symptoms can vary greatly in intensity Phrases: type i allergic reaction, type iv allergic reaction, more... ▸ Words similar to allergic reaction ▸ Usage examples for allergic reaction ▸ Idioms related to allergic reaction ▸ Wikipedia articles (New!) ▸ Words that often appear near allergic reaction ▸ Rhymes of allergic reaction ▸ Invented words related to allergic reaction