tricyclic-antidepressant

tricyclic

[trahy-sahy-klik, -sik-lik]
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:
1890–95; tri- + cyclic

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To tricyclic-antidepressant
Collins
World English Dictionary
tricyclic (traɪˈsaɪklɪk)
 
adj
1.  (of a chemical compound) containing three rings in the molecular structure
 
n
2.  an antidepressant drug having a tricyclic molecular structure

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source
American Heritage
Science Dictionary
tricyclic   (trī-sī'klĭk, -sĭk'lĭk)  Pronunciation Key 
  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.
Cite This Source
Copyright © 2014 Dictionary.com, LLC. All rights reserved.
  • Please Login or Sign Up to use the Recent Searches feature