Tricyclic Definition

trī-sĭklĭk, -sīklĭk
Containing three fused rings of atoms in the molecule.
Webster's New World
Any of a major group of antidepressant drugs that have a tricyclic molecular structure.
Webster's New World
tricyclic antidepressant drugtricyclic antidepressant
Relating to a class of drugs used to treat depression and having a tricyclic chemical structure consisting of two benzene rings fused to opposite sides of a seven-member ring. The seven-member ring consists of six carbon atoms and one nitrogen atom. Tricyclic antidepressants enhance the activity of monoamine neurotransmitters in the brain by inhibiting their reuptake by the cells that secrete them.
American Heritage Science
Composed of or arranged in three distinct whorls, as the petals of a flower.
American Heritage Science

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