from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Containing more than one kind of atom joined in a ring.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Having one or more atoms other than carbon in at least one of its rings.
  • n. A heterocycle

from The Century Dictionary and Cyclopedia

  • 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:

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a compound containing a heterocyclic ring
  • adj. containing a closed ring of atoms of which at least one is not a carbon atom


from Wiktionary, Creative Commons Attribution/Share-Alike License

hetero- +‎ cyclic



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