- heterocyclic compound, heterocyclic, heterocycle - a compound containing a heterocyclic ring
--1 is a kind of compound, chemical compound
--1 has particulars: chelate, chelate compound - heterocyclic ring, heterocycle - a ring of atoms of more than one kind; especially a ring of carbon atoms containing at least one atom that is not carbon
--2 is a kind of closed chain, ring