Tricyclic

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The American Heritage® Dictionary of the English Language, 4th Edition
  • adj. Having or being a molecular structure that contains three closed rings: a tricyclic molecule.
  • n. A tricyclic antidepressant drug.
  • Wiktionary, Creative Commons Attribution/Share-Alike License
  • adj. Having three rings of atoms in the molecule.
  • The Century Dictionary and Cyclopedia
  • In chem., consisting of three rings or closed chains of atoms (usually o. carbon) united together, with any other atoms united to those of such rings. See tricyclic system.
  • WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
  • n. an antidepressant drug that acts by blocking the reuptake of norepinephrine and serotonin and thus making more of those substances available to act on receptors in the brain
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