| acyclic | (adjective) not cyclic; especially having parts arranged in spirals rather than whorls | - |
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| (adjective) having an open chain structure | Synonyms: open-chain |
| bicyclic | (adjective) having molecules consisting of two fused rings | - |
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| carbocyclic | (adjective) having or relating to or characterized by a ring composed of carbon atoms | - |
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| cyclic | (adjective) recurring in cycles | Synonyms: cyclical |
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| (adjective) of a compound having atoms arranged in a ring structure | - |
| (adjective) forming a whorl or having parts arranged in a whorl | - |
| (adjective) conforming to the Carnot cycle | - |
| (adjective) marked by repeated cycles | - |
| epicyclic | (adjective) of or relating to an epicycle | Synonyms: epicyclical |
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| heterocyclic | (adjective) containing a closed ring of atoms of which at least one is not a carbon atom | - |
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| (noun) a compound containing a heterocyclic ring | Synonyms: heterocycle, heterocyclic compound |
| homocyclic | (adjective) containing a closed ring of atoms of the same kind especially carbon atoms | Synonyms: isocyclic |
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| isocyclic | (adjective) containing a closed ring of atoms of the same kind especially carbon atoms | Synonyms: homocyclic |
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| noncyclic | (adjective) not cyclic | Synonyms: noncyclical |
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| (adjective) not having repeated cycles | - |
| 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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