insulator
Pronunciation:
/ˈɪn.sjə.leɪ.tə(ɹ)/noun
Definitions
A substance that does not transmit heat (thermal insulator), sound (acoustic insulator) or electricity (electrical insulator).
A non-conductive structure, coating or device that does not transmit sound, heat or electricity (see image)
Example: To isolate electrical wires from the pylons supporting them, one often uses glass insulators.
A person who installs insulation.