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Definition of Reagin
1. Noun. An immunoglobulin E that is formed as an antibody against allergens (such as pollen); attaches to cell membranes causing the release of histamine and other substances responsible for the local inflammation characteristic of an allergy.
Definition of Reagin
1. a type of antibody [n -S] : REAGINIC [adj] - See also: antibody
Medical Definition of Reagin
1.