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anaphylaxis

American

[an-uh-fuh-lak-sis] / ˌæn ə fəˈlæk sɪs /

noun

Pathology.

exaggerated allergic reaction to a foreign protein resulting from previous exposure to it.

anaphylaxis British

/ ˌænəfɪˈlæksɪs /

noun

extreme sensitivity to an injected antigen, esp a protein, following a previous injection

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

anaphylaxis Scientific

/ ăn′ə-fə-lăk′sĭs /

See anaphylactic shock

Other Word Forms

Etymology

Origin of anaphylaxis

First recorded in 1905–10; ana- + (pro)phylaxis

Compare meaning

How does anaphylaxis compare to similar and commonly confused words? Explore the most common comparisons:

anaphylaxis vs. anaphylactic shock

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

See Examples For:

anaphylaxis

At least one person is known to have died after receiving the drug cetuximab to treat colon cancer and going into anaphylaxis.

From BBC ● Jul. 20, 2026

Baxter was not given anti-venom over concerns about his breathing and possible side effects, which can include anaphylaxis.

From BBC ● Apr. 24, 2026

The results also pointed to an extreme immune response consistent with fatal anaphylaxis.

From Science Daily ● Dec. 17, 2025

The immune system tries to fight them off, triggering symptoms ranging from hives and diarrhea to anaphylaxis, a life-threatening condition.

From Los Angeles Times ● Oct. 20, 2025

Foreign protein sensitization or anaphylaxis was the basis of Dr. Rutledge's coup.

From The Sword and the Atopen by Taylor H. Greenfield

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023