Definition of "insulator" in English

noun

1. A substance that does not transmit heat (thermal insulator), sound (acoustic insulator) or electricity (electrical insulator).

2. A non-conductive structure, coating or device that does not transmit sound, heat or electricity (see image)

   • To isolate electrical wires from the pylons supporting them, one often uses glass insulators.

3. A person who installs insulation.