Definitions from Wiktionary (insulator)

▸ noun:  A substance that does not transmit heat (thermal insulator), sound (acoustic insulator) or electricity (electrical insulator).
▸ noun:  A non-conductive structure, coating or device that does not transmit sound, heat or electricity (see image)
▸ noun:  A person who installs insulation.
▸ Also see insulator

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