n :  any of a group of antidepressant drugs (as imipramine, amitriptyline, desipramine, and nortriptyline) that contain three fused benzene rings, potentiate the action of catecholamines, and do not inhibit the action of monoamine oxidase .
 
 
 
Published under license with Merriam-Webster, Incorporated.  © 1997-2004.