serotonin

noun

se·​ro·​to·​nin ˌsir-ə-ˈtō-nən How to pronounce serotonin (audio)
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

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Vitamin B6 can help reduce nausea by supporting the production of serotonin and dopamine. Peter Weiss, Verywell Health, 28 Jan. 2025 Exercise is another key element that boosts blood flow, which can increase serotonin and dopamine. Lauryn Higgins, Flow Space, 28 Jan. 2025 Furthermore, SSRIs are systemically absorbed, leading to an increase in serotonin levels in not only the brain but also the gut. Kara Margolis, Chicago Tribune, 21 Jan. 2025 Omega-3 Packed Foods Fatty fish, oysters, and seeds all contain omega-3, which increases serotonin. Elizabeth Ayoola, Essence, 17 Jan. 2025 See all Example Sentences for serotonin 

Word History

Etymology

sero- + ton(ic) entry 2 or tone entry 1 + -in entry 1, probably after angiotonin, earlier name for angiotensin — more at angiotensin

Note: Term introduced by Maurice M. Rapport, Arda Alden Green and Irvine H. Page in "Crystalline serotonin," Science, vol. 108, Issue 2804 (September 24, 1948), pp. 329-330: "The general behavior of the crystalline substance is suggestive of its homogeneity. We would like provisionally to name it serotonin, which indicates that its source is serum and its activity is one of causing constriction."

First Known Use

1948, in the meaning defined above

Time Traveler
The first known use of serotonin was in 1948

Dictionary Entries Near serotonin

Cite this Entry

“Serotonin.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/serotonin. Accessed 2 Feb. 2025.

Medical Definition

serotonin

noun
se·​ro·​to·​nin ˌsir-ə-ˈtō-nən How to pronounce serotonin (audio) ˌser- How to pronounce serotonin (audio)
: 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

More from Merriam-Webster on serotonin

Last Updated: - Updated example sentences
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!