from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A heterocyclic compound or ring.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a ring of atoms of more than one kind; especially a ring of carbon atoms containing at least one atom that is not carbon
- n. a compound containing a heterocyclic ring
hetero- + cycle (Wiktionary)