serotonin
noun
se·ro·to·nin
ˌsir-ə-ˈtō-nən 
ˌser-
: a phenolic amine neurotransmitter C10H12N2O that is a powerful vasoconstrictor and is found especially in the brain, blood serum, and gastric mucous membrane of mammals
Examples of serotonin in a Sentence
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Movement is linked with the release of feel-good neurotransmitters dopamine and serotonin, too, which can help combat symptoms of depression, Dr. Gallagher says.
—
Korin Miller, SELF, 24 July 2025
The medications increase levels of serotonin, a chemical messenger in the brain that can improve mood.
—Aria Bendix, NBC news, 21 July 2025
These supplements may affect levels of dopamine and serotonin, or reduce inflammation.
—Kaitlin Sullivan, Health, 16 July 2025
Estrogen also influences the production and activity of key neurotransmitters like: serotonin, dopamine and norepinephrine.
—Lauryn Higgins, Flow Space, 11 July 2025
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Korin Miller, SELF, 24 July 2025
The medications increase levels of serotonin, a chemical messenger in the brain that can improve mood.
—Aria Bendix, NBC news, 21 July 2025
These supplements may affect levels of dopamine and serotonin, or reduce inflammation.
—Kaitlin Sullivan, Health, 16 July 2025
Estrogen also influences the production and activity of key neurotransmitters like: serotonin, dopamine and norepinephrine.
—Lauryn Higgins, Flow Space, 11 July 2025
See All Example Sentences for serotonin
Cite this Entry
“Serotonin.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/serotonin. Accessed 5 Aug. 2025.
Copy CitationMedical Definition
serotonin
noun
se·ro·to·nin
ˌsir-ə-ˈtō-nən
ˌser-
ˌser-
: a phenolic amine neurotransmitter C10H12N2O that is a powerful vasoconstrictor and is found especially in the brain, blood serum, and gastric mucous membrane of mammals
called also 5-HT, 5-hydroxytryptamine
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