| NOUN | state | allergic reaction, allergy | hypersensitivity reaction to a particular allergen |
|---|
| Meaning | hypersensitivity reaction to a particular allergen; symptoms can vary greatly in intensity. | |
|---|---|---|
| Synonym | allergy | |
| Narrower | delayed allergy, type IV allergic reaction | An allergic reaction that becomes apparent only hours after contact |
| 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) |
| Spanish | alergia | |
| Catalan | al·lèrgia | |
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