Medical Dictionary

allergoid

noun al·ler·goid \ ˈa-lər-ˌgȯid \

medical Definition of allergoid

:an allergen (such as pollen) that has been chemically modified and is used especially in immunotherapy to treat allergic conditions by lessening the immune response
  • An allergoid made from ragweed allergen and injected into someone with hay fever could teach ragweed-specific [T helper] cells not to give the “go ahead” signal for a reaction to real ragweed pollen.
  • —Johnathan Brostoff and Linda Gamlin, Hay Fever: The Complete Guide …2002
Note: Allergoids are less likely to bind to the immunoglobulin IgE and cause serious side effects during treatment.

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