(1) A material such as glass or porcelain with negligible electrical or thermal conductivity
From insulate 'to isolate' (itself from insula 'island') + suffix -or
- 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)
- To isolate electrical wires from the pylons supporting them, one often uses glass insulators.