[in-suh-ley-ter, ins-yuh-] /ˈɪn səˌleɪ tər, ˈɪns yə-/


a person or thing that insulates.
any material or device that insulates, esp a material with a very low electrical conductivity or thermal conductivity or something made of such a material

1801, agent noun in Latin form from insulate.
A material or an object that does not easily allow heat, electricity, light, or sound to pass through it. Air, cloth and rubber are good electrical insulators; feathers and wool make good thermal insulators. Compare conductor.

A material that does not easily transmit energy, such as electric current or heat. Materials such as wood, plastic, and ceramics are insulators. Fiberglass is an example of a heat insulator. (Compare conductor.)


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