Definition of norepinephrine in English:

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Pronunciation: /ˌnôrepəˈnefrən/


A hormone that is released by the adrenal medulla and by the sympathetic nerves and functions as a neurotransmitter. It is also used as a drug to raise blood pressure. Also called noradrenaline.
  • Chemical formula: (HO)2C6H3CHOHCH2NH2.
Example sentences
  • When you're under stress your adrenal glands produce the hormones cortisol, norepinephrine, and adrenaline.
  • Within the adrenal medulla dopamine is converted to norepinephrine and epinephrine.
  • As a natural response to a diseased heart, the body releases the hormone norepinephrine, causing the heart to beat up to five times faster than normal.


1940s: from nor- + epinephrine.

For editors and proofreaders

Syllabification: nor·ep·i·neph·rine

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