Etymology
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anaphylactic (adj.)

"of or pertaining to a severe allergic reaction," 1905, with -ic + medical Latin noun anaphylaxis "exaggerated susceptibility," from Greek ana- "up" (see ana-) + phylaxis "protection," from phylax "guardian, watcher, protector," a word of unknown origin. Compare prophylactic. Anaphylactic shock is attested by 1916.

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Definitions of anaphylactic

anaphylactic (adj.)
related to the hypersensitivity known as anaphylaxis;
anaphylactic shock
From wordnet.princeton.edu