reagin

noun

re·agin | \ rē-ˈā-jən,

-gən\

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

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The first known use of reagin was circa 1911

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reagin

noun

re·agin | \ rē-ˈā-jən,

\

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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