Anaphylaxis

n. vulnerability; abnormal sensitivity to proteins

Anaphylaxis is an acute systemic (multi-system) and severe Type I Hypersensitivity allergic reaction in humans and other mammals. The term comes from the Greek words ana (against) and phylaxis (protection). Anaphylaxis occurs when a person or animal is exposed to a trigger substance, called an allergen, to which they have already become sensitized. Minute amounts of allergens may cause a life-threatening anaphylactic reaction. Anaphylaxis may occur after ingestion, skin contact, injection of an allergen or, in rare cases, inhalation.
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Anaphylaxis is a rapidly progressing, life-threatening allergic reaction. Description Anaphylaxis is a type of allergic [more]Anaphylaxis - Community and Resources

Noun
1. hypersensitivity reaction to the ingestion or injection of a substance (a protein or drug) resulting from prior contact with a substance
(hypernym) hypersensitivity reaction
(hyponym) anaphylactic shock
(classification) drug

noun
reaction, similar to an allergic reaction, to an injection or to a bee sting