epinephrine
noun
epi·neph·rine
ˌe-pə-ˈne-frən 
variants
or less commonly epinephrin
: a crystalline sympathomimetic hormone C9H13NO3 that is the principal blood-pressure raising hormone secreted by the medulla of the adrenal glands, is prepared from adrenal extracts or made synthetically, and is used medicinally especially to stimulate the heart during cardiac arrest and to treat life-threatening allergic reactions
called also adrenaline
Examples of epinephrine in a Sentence
Recent Examples on the Web
Children who have an allergy that could cause anaphylaxis symptoms such throat swelling and other severe reactions have long had to carry an epinephrine injectable pen with them or have one stored at school.
—
Nicole Villalpando, Austin American Statesman, 2 July 2025
The traditional treatment for anaphylaxis is a shot of the hormone epinephrine into the leg muscle.
—Breanne Hayes Haney, The Conversation, 14 Apr. 2025
The algorithm can predict the reaction’s severity, alert the individual and caregivers, and automatically inject epinephrine when necessary.
—David Henkin, Forbes.com, 20 May 2025
For an epinephrine injection to work, it should be given at the first sign of an allergic reaction.
—Adrianna Rodriguez, USA Today, 12 June 2025
See All Example Sentences for epinephrine
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Nicole Villalpando, Austin American Statesman, 2 July 2025
The traditional treatment for anaphylaxis is a shot of the hormone epinephrine into the leg muscle.
—Breanne Hayes Haney, The Conversation, 14 Apr. 2025
The algorithm can predict the reaction’s severity, alert the individual and caregivers, and automatically inject epinephrine when necessary.
—David Henkin, Forbes.com, 20 May 2025
For an epinephrine injection to work, it should be given at the first sign of an allergic reaction.
—Adrianna Rodriguez, USA Today, 12 June 2025
See All Example Sentences for epinephrine
Cite this Entry
“Epinephrine.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/epinephrine. Accessed 29 Jul. 2025.
Copy CitationMedical Definition
epinephrine
noun
epi·neph·rine
variants
also epinephrin
: a colorless crystalline sympathomimetic hormone C9H13NO3 that is the principal blood-pressure-raising hormone secreted by the adrenal medulla, is prepared from adrenal extracts or made synthetically, and is used medicinally especially to stimulate the heart during cardiac arrest and to treat life-threatening allergic reactions
called also adrenaline
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