Pronunciation: (trī-sī'klik, -sik'lik), [key]
pertaining to or embodying three cycles.
Also called tricy'clic antidepres'sant. Pharm.any of a group of pharmacologically active substances, as imipramine, that share a common three-ring structure, used to treat depression and cocaine abuse.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.