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serotonin Syllabification: ser·o·to·nin
Pronunciation: /ˌsirəˈtōnən/

Definition of serotonin in English:


A compound present in blood platelets and serum that constricts the blood vessels and acts as a neurotransmitter.
  • Alternative name: 5-hydroxytryptamine; chemical formula: C10H12N2O
Example sentences
  • Tryptophan is an amino acid that serves as a precursor to the neurotransmitter serotonin.
  • These physiological changes decrease patients' pain thresholds and thereby increase pain sensation, anxiety, fear, and the release of pain transmitters, such as histamines, serotonins, kinins, and prostaglandins.
  • These work by raising the levels of the chemicals serotonin and noradrenaline in the brain, which both tend to elevate the mood.


1940s: from serum + tonic + -in1.

Words that rhyme with serotonin

Cronin, phone-in, ronin
Definition of serotonin in:
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