a complex amine, CHNO, found in blood, the brain, etc. or produced synthetically: it constricts the blood vessels and contracts smooth muscle tissue, and is important as both a neurotransmitter and a hormone
Origin of serotoninsero- + ton(ic) + -in
An organic compound, C10H12N2O, that is formed from tryptophan and is found especially in the gastrointestinal tract, the platelets, and the nervous system of humans and other animals, and functions as a neurotransmitter and in vasoconstriction, stimulation of the smooth muscles, and regulation of cyclic body processes.
Origin of serotoninsero- ton(e) -in
From sero- + tonic + -in.