adjheterocycliccontaining a closed ring of atoms of which at least one is not a carbon atom
nheterocyclica compound containing a heterocyclic ring
Century Dictionary and Cyclopedia
heterocyclicIn chem., of a substance the molecule is believed to consist of a ring or continuous chain of atoms, containing in such a ring atoms of more than a single element. Thus the molecule of pyridine consists of a ring of six atoms consecutively united with each other, five of these atoms being of carbon and one of nitrogen (each carbon atom having also a hydrogen atom attached to it)—thus:
Heterocyclic Nitrogen- and Sulfur-Containing Aroma Chemicals.