1. Any of a class of plastics that because of its ionic bonding action is capable of conducting electric current.
2. Polymer with covalent bonds between the elements of the chain and ionic bonds between the chains.
3. A polymer; such as, a polystyrene or polyacrylic, having unique physical properties because of the ionic interactions in discrete (separate and unconnected) regions of the material.
4. A polymer containing ion and in dentistry, ionomers are a mixture of glass and an organic acid.

They are clear but vary in the amount of translucency; so, for this reason, their aesthetic potential does not match that of composite resins.

1. A copolymer (chemical with high molecular weight) of ethylene (flammable gas) and vinyl monomer (single unjoined organic molecule) with an acid group, forming a transparent, resilient thermoplastic material used in making bottles, pipes and tubing, and electroconductive elements.
2. A polymer which has ethylene as the major component, but which contains both covalent and ionic bonds.