WordNet (r) 3.0 (2006):

tricyclic antidepressant
    n 1: 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
         [syn: tricyclic, tricyclic antidepressant, tricyclic
         antidepressant drug]