Definitions for "tricyclic"
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
general class of medications, tricyclic antidepressants. The term refers to their chemical structure, which includes three rings of carbon atoms.
In psychopharmacology, a class of antidepressant medications.