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
Experts are advising anyone already sensitive to bee or wasp stings to speak with their doctor about carrying an epinephrine auto-injector as a precaution.
—
Moná Thomas, PEOPLE, 4 June 2026
Experiencing an emotion such as desperation is inseparable from having stress hormones such as cortisol and epinephrine flood one’s body.
—Ted Chiang, The Atlantic, 3 June 2026
However, people must be monitored after vaccination and should have access to epinephrine in case of a severe allergic reaction.
—Suchandrima Bhowmik, Health, 15 May 2026
The doctor rushed her to a room without checking her in, saw her blood pressure was low, and administered two epinephrine injections and IV fluids, Toska said.
—Andrew Jones, Miami Herald, 28 Apr. 2026
See All Example Sentences for epinephrine
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Moná Thomas, PEOPLE, 4 June 2026
Experiencing an emotion such as desperation is inseparable from having stress hormones such as cortisol and epinephrine flood one’s body.
—Ted Chiang, The Atlantic, 3 June 2026
However, people must be monitored after vaccination and should have access to epinephrine in case of a severe allergic reaction.
—Suchandrima Bhowmik, Health, 15 May 2026
The doctor rushed her to a room without checking her in, saw her blood pressure was low, and administered two epinephrine injections and IV fluids, Toska said.
—Andrew Jones, Miami Herald, 28 Apr. 2026
See All Example Sentences for epinephrine
Cite this Entry
“Epinephrine.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/epinephrine. Accessed 9 Jun. 2026.
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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