anaphylactic
adjective(ana-phy-lac-tic)
of, relating to, affected by, or causing anaphylaxis or anaphylactic shock
anaphylactic
noun(ana-phy-lac-tic)
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