n. Any compound having a single amino functional group, especially a neurotransmitter.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. a molecule containing one amine group (especially one that is a neurotransmitter)
Word Usage
"Swedish psychologist Eva Longato-Stadler found that criminals with personality disorders had lower than normal levels of an enzyme called monoamine oxidase, which affects the ability of the brain to use or synthesize serotonin."