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tricyclic

[trahy-sahy-klik, -sik-lik] /traɪˈsaɪ klɪk, -ˈsɪk lɪk/
adjective
1.
pertaining to or embodying three cycles.
noun
2.
Also called tricyclic antidepressant. Pharmacology. any of a group of pharmacologically active substances, as imipramine, that share a common three-ring structure, used to treat depression and cocaine abuse.
Origin
1890-1895
1890-95; tri- + cyclic
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for tricyclic-antidepressant

tricyclic

/traɪˈsaɪklɪk/
adjective
1.
(of a chemical compound) containing three rings in the molecular structure
noun
2.
an antidepressant drug having a tricyclic molecular structure
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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tricyclic-antidepressant in Science
tricyclic
  (trī-sī'klĭk, -sĭk'lĭk)   
  1. Relating to a chemical compound having three closed rings. Anthracene is a tricyclic hydrocarbon.

  2. 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.

  3. Composed of or arranged in three distinct whorls, as the petals of a flower.


The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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