nor·​epi·​neph·​rine | \ ˈnȯr-ˌe-pə-ˈne-frən How to pronounce norepinephrine (audio) \

Definition of norepinephrine

: a monoamine C8H11NO3 that is a neurotransmitter in postganglionic neurons of the sympathetic nervous system and in some parts of the central nervous system, is a vasopressor hormone of the adrenal medulla, and is a precursor of epinephrine in its major biosynthetic pathway

Examples of norepinephrine in a Sentence

Recent Examples on the Web Under stress, Hsu and her colleagues found, the sympathetic nervous system is active and produces the chemical norepinephrine, which in turn triggers melanocyte stem cells to go into overdrive, all of them converting to pigment-producing cells. Brigit Katz, Smithsonian Magazine, "When Stressed Out, Mice’s Fur Turns Gray Quickly," 29 Jan. 2020 Positive thinking also increases the levels of feel-good hormones like serotonin and norepinephrine, which prime the brain to seek more of the same positive vibes. Jamie Kiffel-alcheh, National Geographic, "How to keep kids positive through the pandemic," 4 May 2020 According to her, putting on an outfit in the morning releases neurotransmitters in our brains including dopamine, serotonin, norepinephrine, and endorphins, sparking a sense of purpose. Sara Radin,, "The Case For Getting Dressed," 25 Mar. 2020 Wang has long studied norepinephrine because of its role in thinking and complex behaviors. Karen Weintraub, Scientific American, "Possible Missing Link in Alzheimer’s Pathology Identified," 16 Jan. 2020 Medical personnel at the rink, Tucson Convention Center, and nearby St. Mary’s Hospital performed about 85 minutes of CPR and injected him with epinephrine and norepinephrine., "is back in the NHL, and he is grateful.," 20 Oct. 2019 The hormones epinephrine and norepinephrine play a key role in the response, increasing heart rate and blood pressure. Kelly Servick, Science | AAAS, "How the body’s nerves become accomplices in the spread of cancer," 12 Sep. 2019 The brain send a distress signal, and the hormones adrenaline and cortisol are released, as well as norepinephrine, dopamine. The Editors, Marie Claire, "Every Question About Anxiety You've Ever Had, Answered," 8 July 2019 Tricyclic antidepressants, which hinder reabsorption of the neurotransmitters serotonin and norepinephrine (this is implicated in your fight-or-flight response, are another common option for both panic attacks and anxiety, according to the DSM-5. Cassie Shortsleeve, SELF, "Is There a Difference Between an Anxiety Attack and a Panic Attack?," 12 Sep. 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'norepinephrine.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of norepinephrine

1937, in the meaning defined above

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The first known use of norepinephrine was in 1937

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Last Updated

16 Aug 2020

Cite this Entry

“Norepinephrine.” Dictionary, Merriam-Webster, Accessed 25 Sep. 2020.

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nor·​epi·​neph·​rine | \ ˌnȯr-ˌep-ə-ˈnef-rən How to pronounce norepinephrine (audio) , -rēn How to pronounce norepinephrine (audio) \

Medical Definition of norepinephrine

: a catecholamine C8H11NO3 that is the chemical means of transmission across synapses in postganglionic neurons of the sympathetic nervous system and in some parts of the central nervous system, is a vasopressor hormone of the adrenal medulla, and is a precursor of epinephrine in its major biosynthetic pathway

called also arterenol, noradrenaline

— see levophed

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