allergic reaction

/əˌlʌrdʒɪk riˌækʃən/

/əˈlʌdʒɪk riˈækʃɪn/

Other forms: allergic reactions

Definitions of allergic reaction

1. noun

   hypersensitivity reaction to a particular allergen; symptoms can vary greatly in intensity
   synonyms: allergy

   types:

   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