dielectric /ˌdaɪ.ɪˈlɛk.tɹɪk/adjective 1noun 1forms 3 adjective1 •insulating noun1 •An electrically insulating or nonconducting material considered for its electric susceptibility, i.e. its property of polarization when exposed to an external electric field. formsdielectrics · more dielectric · most dielectric