| Meaning | hypersensitivity reaction to a particular allergen; symptoms can vary greatly in intensity. |
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| Synonym | allergic reaction |
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| Narrower | delayed allergy, type IV allergic reaction | An allergic reaction that becomes apparent only hours after contact |
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| food allergy | allergic reaction to a substance ingested in food |
| immediate allergy, atopy, atopic allergy, type I allergic reaction | An allergic reaction that becomes apparent in a sensitized person only minutes after contact |
| serum sickness, serum disease | A delayed allergic reaction to the injection of an antiserum caused by an antibody reaction to an antigen in the donor serum |
| Broader | hypersensitivity reaction | An inappropriate and excessive reaction to an allergen (as pollen or dust or animal hair or certain foods) |
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| Spanish | alergia |
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| Catalan | al·lèrgia |
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| Adjectives | allergic | characterized by or caused by allergy |
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| allergic | having an allergy or peculiar or excessive susceptibility (especially to a specific factor) |
| Nouns | allergist | a physician skilled in the diagnosis and treatment of allergies |
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