noun
a medical condition in which the immune system overreacts to a foreign substance
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Anaphylaxis is a severe, potentially life-threatening allergic reaction.
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If you have anaphylaxis, you need to carry an EpiPen with you at all times.
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Dude, my friend had a crazy case of anaphylaxis after eating peanuts.
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The sudden drop in stock prices caused anaphylaxis in the market.