| NOUN | object | heterocyclic ring, heterocycle | a ring of atoms of more than one kind |
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| Meaning | A ring of atoms of more than one kind; especially a ring of carbon atoms containing at least one atom that is not carbon. | |
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| Synonym | heterocycle | |
| Broader | closed chain, ring | (chemistry) a chain of atoms in a molecule that forms a closed loop |
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