Dielectric

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dielectric

More or less a synonym for electrical insulator, a material with a low (compared with that of a metal) electrical conductivity.

The term insulator is more precise given that at some frequencies the relative permittivity (or dielectric function) of a material usually described as an insulator may have values thought to be characteristic of metals, and at other frequencies the relative permittivity of a metal may have values thought to be characteristic of a dielectric (insulator).