Definition of reagin
1 : a substance in the blood of persons with syphilis responsible for positive serological reactions for syphilis
2 : an antibody (such as IgE in humans) that mediates hypersensitive allergic reactions of rapid onset
From the M-W Editors
Origin and Etymology of reagin
International Scientific Vocabulary, from reagent
Medical Dictionary
Medical Definition of reagin
1: a substance that is in the blood of individuals with syphilis and is responsible for positive serological reactions for syphilis
2: an antibody (as IgE in humans) that mediates hypersensitive allergic reactions of rapid onset
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