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insulator

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The definition of an insulator is something that is used to keep heat or sound contained, or something that does not conduct electricity.

(noun)

Soundproofing material is an example of an insulator.
A substance that doesn't conduct electricity well is an example of an insulator.

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See insulator in Webster's New World College Dictionary

noun

anything that insulates; specif.,

a nonconductor of electricity, heat, or sound
a device, as of glass or porcelain, for insulating and supporting electric wires

See insulator in American Heritage Dictionary 4

noun

A material that insulates, especially a nonconductor of sound, heat, or electricity.
A device that insulates.

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