allergic reaction

Definitions of allergic reaction
1

n hypersensitivity reaction to a particular allergen; symptoms can vary greatly in intensity

Synonyms:
allergy
Types:
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food allergy
allergic reaction to a substance ingested in food
atopic allergy, atopy, immediate allergy, type I allergic reaction
an allergic reaction that becomes apparent in a sensitized person only minutes after contact
serum disease, serum sickness
a delayed allergic reaction to the injection of an antiserum caused by an antibody reaction to an antigen in the donor serum
delayed allergy, type IV allergic reaction
an allergic reaction that becomes apparent only hours after contact
Type of:
hypersensitivity reaction
an inappropriate and excessive reaction to an allergen (as pollen or dust or animal hair or certain foods); severity ranges from mild allergy to severe systemic reactions leading to anaphylactic shock

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