"heterocyclic" in the noun sense
1. heterocyclic compound, heterocyclic, heterocycle
a compound containing a heterocyclic ring
"heterocyclic" in the adjective sense
1. heterocyclic
containing a closed ring of atoms of which at least one is not a carbon atom
Source: WordNet® (An amazing lexical database of English)
Princeton University "About WordNet®."
WordNet®. Princeton University. 2010.
View WordNet® License