| heterocyclic | (noun) a compound containing a heterocyclic ring | Synonyms: heterocycle, heterocyclic compound |
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| nontricyclic | (noun) a class of antidepressant drugs that are not tricyclic drugs and do not act by inhibiting MAO | Synonyms: nontricyclic antidepressant, nontricyclic antidepressant drug, nontricyclic drug |
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| tricyclic | (noun) 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 | Synonyms: tricyclic antidepressant, tricyclic antidepressant drug |
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