anaphylaxis
noun
ana·phy·lax·is
ˌa-nə-fə-ˈlak-səs 
plural anaphylaxes
ˌa-nə-fə-ˈlak-ˌsēz
1
: hypersensitivity (as to foreign proteins or drugs) resulting from sensitization following prior contact with the causative agent
Examples of anaphylaxis in a Sentence
Recent Examples on the Web
Allergic reactions and anaphylaxis have been reported in patients using bee venom therapy.
—
Stephanie Brown,
Verywell Health,
19 June 2026
Avoid triggers, but carry an epinephrine pen for emergency treatment of anaphylaxis for when triggers are unavoidable or unknown.
—
Ruth Jessen Hickman,
Health,
12 June 2026
Some people are allergic to different venoms, and could experience life-threatening anaphylaxis without immediate treatment.
—
Sophie Lindberg,
Kansas City Star,
10 June 2026
Food allergies are the leading cause of anaphylaxis, which is a sudden and potentially life-threatening allergic reaction.
—
Raven Brunner,
PEOPLE,
31 May 2026
See All Example Sentences for anaphylaxis
Examples are automatically compiled from online sources to
show current usage.
Read More
Opinions expressed in the examples do not represent those of Merriam-Webster or its editors.
Send us feedback.
Stephanie Brown,
Verywell Health,
19 June 2026
Avoid triggers, but carry an epinephrine pen for emergency treatment of anaphylaxis for when triggers are unavoidable or unknown.
—
Ruth Jessen Hickman,
Health,
12 June 2026
Some people are allergic to different venoms, and could experience life-threatening anaphylaxis without immediate treatment.
—
Sophie Lindberg,
Kansas City Star,
10 June 2026
Food allergies are the leading cause of anaphylaxis, which is a sudden and potentially life-threatening allergic reaction.
—
Raven Brunner,
PEOPLE,
31 May 2026
See All Example Sentences for anaphylaxis
Cite this Entry
“Anaphylaxis.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/anaphylaxis. Accessed 27 Jun. 2026.
Copy CitationMedical Definition
anaphylaxis
noun
ana·phy·lax·is
ˌan-ə-fə-ˈlak-səs
plural anaphylaxes
-ˌsēz
1
: hypersensitivity (as to foreign proteins or drugs) resulting from sensitization following prior contact with the causative agent
Love words? Need even more definitions?
Merriam-Webster unabridged
