from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. An organic compound, C10H12N2O, formed from tryptophan and found in animal and human tissue, especially the brain, blood serum, and gastric mucous membranes, and active as a neurotransmitter and in vasoconstriction, stimulation of the smooth muscles, and regulation of cyclic body processes.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. An indoleamine neurotransmitter, 5-hydroxytryptamine, that is involved in depression, appetite, etc., and is crucial in maintaining a sense of well-being, security, etc.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a neurotransmitter involved in e.g. sleep and depression and memory


from The American Heritage® Dictionary of the English Language, 4th Edition

sero- + ton(e) + -in.

from Wiktionary, Creative Commons Attribution/Share-Alike License

From sero- + tonic + -in.


  • Anxiety and depression occur when too much serotonin is reuptaken and spends its time hiding in the nerve cells.

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  • These experiments, which might have been the last performed by the hands of Jessell, led to the isolation of genes encoding the seven transmembrane domain serotonin receptor,

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  • If serotonin from the pineal does get back into the brain proper, it a must do so through such a circuitous route that many workers discredit this possibility.

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  • For the past two decades, treatments for depression have been based primarily on a brain chemical called serotonin, which is also linked to mood. Top Stories

  • It may be that this essential fatty acid helps to build brain receptors for neurotransmitters such as serotonin, which is known to improve mood.

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  • Spending time with a BFF tamps down the "fight-or-flight" stress hormones and helps a woman's body create serotonin, which is the feel good brain neurotransmitter that keeps depression at bay and mood even.

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  • The current generation of anti-depressant drugs, which change the way the brain absorbs a neurotransmitter called serotonin, are probably no more effective than placebos.

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  • People suffering from depression so characteristically have lower serotonin levels that an entire class of anti-depressive medications called serotonin uptake inhibitors including Prozac, Paxil, and Zooloft have been developed that raise brain levels of serotonin.

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  • It helps to raise levels of the feel-good and calming brain chemical, serotonin, which is often low in PMS sufferers.

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  • They work by preventing a brain chemical called serotonin from being reabsorbed by neurons.

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