an‧a‧phy‧lac‧tic shock /ˌænəfəlæktɪk ˈʃɒk, ˌænəfɪlæktɪk ˈʃɒk $ -ˈʃɑːk/ noun [uncountable] medical
a very sudden serious physical reaction that is caused by an allergy to something such as nuts, eggs, or the sting of some insects. The reaction causes shock, breathing difficulties, and sometimes death.

[TahlilGaran] Dictionary of Contemporary English ▲