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
sero- + ton(e) + -in.(American Heritage® Dictionary of the English Language, Fourth Edition)
From sero- + tonic + -in. (Wiktionary)