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''epinephrine'' ▫ᴱᴺ｜Definition｜1st｜20260915190735-00-⌔

epinephrine - Wiktionary, the free dictionary

English

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Noun

epinephrine (countable and uncountable, plural epinephrines)

  • (biochemistry, organic chemistry, medicine) A catecholamine hormone and neurotransmitter; as a hormone, secreted by the adrenal gland in response to stress (when it stimulates the autonomic nervous system); as a neurotransmitter, synthesized from norepinephrine. It is also used as a medication.
    • ✤ Synonym: adrenaline
    • ✤ At the ER, after deflating me with a cocktail of epinephrine, a steroid and an antihistamine, the doctors scolded me for not coming in more quickly: I could have died of asphyxiation.1
    • ✤ “Anyone who has experienced or witnessed an anaphylaxis reaction knows it can be very stressful deciding when to inject epinephrine to themselves or a child and often delay,” Dr. Jonathan Spergel, chief of the allergy program at Children’s Hospital of Philadelphia, said in a news release from ARS Pharmaceuticals.2

Etymology

From Ancient Greek ἐπι- (epi-, “upon”) + νεφρός (nephrós, “kidney”) + -ine.

Pronunciation

  • IPA: /ˌɛp.ɪˈnɛ.fɹɪn/
  • Audio (US): 🔊
  • Audio (General American): 🔊

Printed 2026-09-15.

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Footnotes

  1. 2023 November 1, “‘We’re sedating women with self-care’: how we became obsessed with wellness”, in The Guardian ‎, →ISSN: ↩

  2. 2024 August 9, Meg Tirrell, “First nasal spray epinephrine drug for emergency allergic reactions gets FDA approval”, in CNN ‎: ↩

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