Definition of anaphylaxis in English:



  • [mass noun] An acute allergic reaction to an antigen (e.g. a bee sting) to which the body has become hypersensitive.

    • ‘Serious allergic reactions, including anaphylaxis, occur rarely, but timely intervention is crucial.’
    • ‘In addition, patients with previous reactions, including anaphylaxis, to the influenza vaccine should not be vaccinated.’
    • ‘Table 7 provides a summary of symptoms of latex exposure and possible anaphylaxis for both conscious and anesthetized patients.’
    • ‘Less common are the type I hypersensitivity reactions which involve anaphylaxis.’
    • ‘We reviewed these evaluations in 60 patients referred after a diagnosis of anaphylaxis in primary care and seen in the allergy clinics at three hospitals in south west London.’


Early 20th century: modern Latin, from Greek ana- again + phulaxis guarding.