anaphylactic

/ˌænəfəˈlæktɪk/

Anything described as anaphylactic has to do with a dangerous allergy. Someone who has an anaphylactic reaction to peanuts can find their face and throat swelling, making it difficult to breathe.

Anaphylactic shock is a full-blown, severe allergic reaction to something like shellfish, nuts, bee stings, or penicillin. This happens when a person's immune system is overly sensitive to specific substances and overreacts in response. An anaphylactic reaction can include itchiness, swelling, and hives, and it can be deadly if it isn't treated. The word comes from the Latin anaphylaxis, which means "exaggerated susceptibility."

Definitions of anaphylactic

1. adjective

   related to or caused by a severe allergic reaction
   “anaphylactic shock”