heterocycle

Science Dictionary
heterocyclic   (hět'ə-rō-sī'klĭk, -sĭk'lĭk)  Pronunciation Key 
Of or relating to a compound containing a closed ring structure made of more than one kind of atom. Pyridine (C5H5N), for example, is a heterocyclic compound, as its ring contains five carbon atoms and one nitrogen atom. Compare homocyclic.
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