In chem., consisting of three rings or closed chains of atoms (usually o. carbon) united together, with any other atoms united to those of such rings. See tricyclic system.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. an antidepressant drug that acts by blocking the reuptake of norepinephrine and serotonin and thus making more of those substances available to act on receptors in the brain
Word Usage
"BMJ finds that an older group of drugs known as tricyclic antidepressants may sometimes be safer in people over the age of 65."