| tricyclic | <chemistry> Containing three fused rings or closed chains in the molecular structure. (19 Jan 1998) |
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| tricyclic antidepressant | <pharmacology> A group of antidepressant medications that share chemical characteristics, side effects and toxicity. Examples include: amitriptyline, amoxapine, clomipramine, desipramine, imipramine, nortriptyline, trimipramine and protriptyline. (19 Jan 1998) |