Definition of anaphylactic shock
: an often severe and sometimes fatal systemic reaction in a susceptible individual upon exposure to a specific antigen (such as wasp venom or penicillin) after previous sensitization that is characterized especially by respiratory symptoms, fainting, itching, and hives
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Merriam-Webster unabridged
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Time Traveler for anaphylactic shock
The first known use of anaphylactic shock was in 1909
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