• WordNet 3.6
    • adj heterocyclic containing a closed ring of atoms of which at least one is not a carbon atom
    • n heterocyclic a compound containing a heterocyclic ring
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Century Dictionary and Cyclopedia
    • heterocyclic In 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:
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In news:

Heterocyclic Nitrogen- and Sulfur-Containing Aroma Chemicals.

In science:

Surface Raman Spectroelectrochemistry.1. Heterocyclic, Aromatic, and Aliphatic-Amines Adsorbed on Anodized Silver Electrode. J.
Carbon Nanotubes in Biology and Medicine: in vitro and in vivo Detection, Imaging and Drug Delivery