heterocyclic ring is a noun meaning "a ring of atoms of more than one kind; especially a ring of carbon atoms containing at least one atom that is not carbon". It carries one recorded sense.
a ring of atoms of more than one kind; especially a ring of carbon atoms containing at least one atom that is not carbon
Definitions, synonyms and semantic relations for heterocyclic ring come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.