norepinephrine
noun
nor·epi·neph·rine
ˈnȯr-ˌe-pə-ˈne-frən 
: 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
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TCAs, like amitriptyline (Elavil), are primarily used to treat depression but also work by increasing the levels of certain neurotransmitters like serotonin and norepinephrine in the brain and spinal cord.
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New Atlas, 22 Apr. 2025
These results suggest that sleeping aids that impact norepinephrine production—which includes most sleeping aids—might harm the brain’s waste-removal system.
—Margherita Bassi, Smithsonian Magazine, 10 Jan. 2025
Neurotransmitters like oxytocin, dopamine and norepinephrine are all released, each of which contribute to the feeling of attachment and reward.
—Mark Travers, Forbes.com, 7 Apr. 2025
The medications work by amplifying the activity of the neurotransmitters dopamine and norepinephrine in the nerve cells of the brain.
—Christina Caron, New York Times, 27 Mar. 2025
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New Atlas, 22 Apr. 2025
These results suggest that sleeping aids that impact norepinephrine production—which includes most sleeping aids—might harm the brain’s waste-removal system.
—Margherita Bassi, Smithsonian Magazine, 10 Jan. 2025
Neurotransmitters like oxytocin, dopamine and norepinephrine are all released, each of which contribute to the feeling of attachment and reward.
—Mark Travers, Forbes.com, 7 Apr. 2025
The medications work by amplifying the activity of the neurotransmitters dopamine and norepinephrine in the nerve cells of the brain.
—Christina Caron, New York Times, 27 Mar. 2025
See All Example Sentences for norepinephrine
Cite this Entry
“Norepinephrine.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/norepinephrine. Accessed 30 Apr. 2025.
Copy CitationKids Definition
norepinephrine
noun
nor·epi·neph·rine
ˈnȯ(ə)r-ˌep-ə-ˈnef-rən
: a hormone that causes blood vessels to contract and helps to transmit nerve impulses in the sympathetic nervous system and in some parts of the central nervous system
Medical Definition
norepinephrine
noun
nor·epi·neph·rine
ˌnȯr-ˌep-ə-ˈnef-rən
-rēn
-rēn
: 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
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Merriam-Webster unabridged
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