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
serotonin
noun(se-ro-to-nin)
ssri
serotonin
noun(se-ro-to-nin)
any of a class of antidepressants (such as fluoxetine) that inhibit the inactivation of serotonin by blocking its reuptake by presynaptic neuron endings —called also selective serotonin reuptake inhibitor