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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For You While more research is needed, current studies suggest that kiwi may support better sleep due to its serotonin, melatonin, and antioxidant properties.
—
Kathleen Ferraro, Verywell Health, 17 Mar. 2025
One theory is that changes in a person's gut microbiome (a collection of microorganisms that live in the gut) can affect serotonin, dopamine, and other chemical messengers in the brain known as neurotransmitters.
—Gaylyn Henderson, Mph, Health, 17 Mar. 2025
For example, tryptophan is precursor to serotonin, the body’s feel-good chemical.
—Fiona Embleton, Glamour, 14 Mar. 2025
For example, the gut produces a significant amount of serotonin and dopamine in our body, which affect our mood and emotions.
—Dr. Baibing Chen, Contributor, CNBC, 11 Mar. 2025
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Kathleen Ferraro, Verywell Health, 17 Mar. 2025
One theory is that changes in a person's gut microbiome (a collection of microorganisms that live in the gut) can affect serotonin, dopamine, and other chemical messengers in the brain known as neurotransmitters.
—Gaylyn Henderson, Mph, Health, 17 Mar. 2025
For example, tryptophan is precursor to serotonin, the body’s feel-good chemical.
—Fiona Embleton, Glamour, 14 Mar. 2025
For example, the gut produces a significant amount of serotonin and dopamine in our body, which affect our mood and emotions.
—Dr. Baibing Chen, Contributor, CNBC, 11 Mar. 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 23 Mar. 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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