Relating to or possessing the properties of a dielectric; capable of being polarized by an electric field without conducting electricity.
From 'dielectric' plus the suffix '-al' to create an adjective form, from Greek 'dia-' (through) and 'elektron' (amber, which was used in early electric experiments).
The dielectric constant measures how much a material amplifies an electric field—water has an incredibly high dielectric constant, which is why it's such an important solvent for ionic compounds.
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