Anaphylactic shock

noun

Definitions

Noun
  1. 1
    A severe and rapid systemic allergic reaction to an allergen, constricting the trachea and causing generalized vasodilation. countable, uncountable
  2. 2
    a severe and rapid and sometimes fatal hypersensitivity reaction to a substance (especially a vaccine or penicillin or shellfish or insect venom) to which the organism has become sensitized by previous exposure wordnet

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