Usually means: Immune system reaction to substances.
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We found 54 dictionaries that define the word allergy:

General (24 matching dictionaries)
  1. allergy: Merriam-Webster
  2. allergy: Oxford Learner's Dictionaries
  3. allergy: American Heritage Dictionary of the English Language
  4. allergy: Collins English Dictionary
  5. allergy: Vocabulary.com
  6. Allergy, allergy: Wordnik
  7. allergy: Cambridge Advanced Learner's Dictionary
  8. allergy: Wiktionary
  9. allergy: Webster's New World College Dictionary, 4th Ed.
  10. allergy: The Wordsmyth English Dictionary-Thesaurus
  11. allergy: Infoplease Dictionary
  12. allergy: Dictionary.com
  13. allergy: Online Etymology Dictionary
  14. allergy: Cambridge Essential American English Dictionary
  15. Allergy (journal), Allergy: Wikipedia, the Free Encyclopedia
  16. allergy: Rhymezone
  17. allergy: AllWords.com Multi-Lingual Dictionary
  18. allergy: FreeDictionary.org
  19. allergy: Mnemonic Dictionary
  20. allergy: TheFreeDictionary.com
  21. allergy: Longman Dictionary of Contemporary English
  22. allergy: Merriam-Webster

Art (3 matching dictionaries)
  1. Allergy: Health & Beauty Glossary
  2. Body Piercing Glossary (No longer online)
  3. Body Piercing Glossary (No longer online)

Business (1 matching dictionary)
  1. BusinessDictionary.com (No longer online)

Computing (1 matching dictionary)
  1. allergy: Encyclopedia

Medicine (20 matching dictionaries)
  1. allergy: Merriam-Webster Medical Dictionary
  2. Dorland's Illustrated Medical Dictionary (No longer online)
  3. Allergy: MedTerms.com Medical Dictionary
  4. Allergy: Allergy Glossary of Terms
  5. Digestive Diseases Dictionary (No longer online)
  6. online medical dictionary (No longer online)
  7. Health and Wellness Dictionary (No longer online)
  8. Probert Encyclopaedia of Medicine (No longer online)
  9. Hair Facts (No longer online)
  10. Hepatitis C Information Central (No longer online)
  11. Allergy Glossary (No longer online)
  12. Specific Diseases/Disorders (No longer online)
  13. KidsHealth Glossary of Medical Words (No longer online)
  14. National Immunization Program Glossary (No longer online)
  15. Glossary of HIV/AIDS Related Terms (No longer online)
  16. A-Z Family health glossary (No longer online)
  17. allergy: Medical dictionary
  18. Rudy's List of Archaic Medical Terms (No longer online)
  19. Allergy: Drug Medical Dictionary
  20. Hyperdictionary (No longer online)

Science (2 matching dictionaries)
  1. Drug Discovery and Development (No longer online)
  2. Botanical Terms (No longer online)

Slang (1 matching dictionary)
  1. allergy: Urban Dictionary

Sports (1 matching dictionary)
  1. Cat Terms (No longer online)

Tech (1 matching dictionary)
  1. Allergy: Beauty & Health Glossary

(Note: See allergies as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
noun:  (medicine, immunology, loosely) A disorder of the immune system causing adverse reactions to substances (allergens) not harmful to most and marked by the body's production of histamines and associated with atopy, anaphylaxis, and asthma; any condition of hypersensitivity to a substance.
noun:  (medicine, immunology, strictly) Specifically, hypersensitivity of class I in the modern classification thereof: the immunoglobulin E–mediated type.
noun:  (informal, figuratively) An antipathy, as toward a person or activity.

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