单词	reagin
释义	reagin noun re·​agin rē-ˈā-jən  -gən 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 reaginic ˌrē-ə-ˈji-nik  -ˈgi- adjective Word History Etymology International Scientific Vocabulary, from reagent First Known Use circa 1911, in the meaning defined at sense 1 Medical Definition reagin noun re·​agin rē-ˈā-jən  -gən  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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