- noun a dielectric substance or non-conductor of electricity
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- noun material which is an electrical insulator or in which an electric field can be sustained with a minimum loss of power
- adjective unable to conduct direct electric current
- A material which is an electric insulator. An electric field may be applied through such a material with little or no energy loss. Dielectrics are used, for instance, to separate the plates in a capacitor, or between the conductors of a cable. Examples of dielectrics include air, oil, glass, paper, rubber, and various plastics and ceramics. A vacuum is a perfect dielectric. Also known as dielectric material.