Etymology
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anaphylaxis (n.)

"severe allergic reaction," 1905, from Latin anaphylaxis, perhaps based on French anaphylaxie (1902); see anaphylactic.

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Definitions of anaphylaxis

anaphylaxis (n.)
hypersensitivity reaction to the ingestion or injection of a substance (a protein or drug) resulting from prior contact with a substance;
From wordnet.princeton.edu