serotonin

2 ENTRIES FOUND:

se·ro·to·nin

noun \ˌsir-ə-ˈtō-nən, ˌser-\

Definition of SEROTONIN

:  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

Origin of SEROTONIN

sero- + tonic + 1-in
First Known Use: 1948

se·ro·to·nin

noun \ˌsir-ə-ˈtō-nən, ˌser-\   (Medical Dictionary)

Medical Definition of SEROTONIN

: 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

serotonin

noun    (Concise Encyclopedia)

Chemical (5-hydroxytryptamine, or 5-HT) derived from the amino acid tryptophan. It occurs in brain and intestinal tissue, platelets, and certain connective-tissue cells and is a component of many animal venoms (e.g., wasp, toad). A strong stimulator of blood-vessel constriction and a neurotransmitter, serotonin concentrates in certain brain areas, especially the midbrain and hypothalamus. Some cases of depression are apparently caused by reduced amounts or activity of serotonin in the brain; many antidepressants counteract that condition. Excessive brain serotonin activity may cause migraine headaches and nausea. LSD may act by inhibiting the action of serotonin.

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