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

noun. A device that insulates.

noun. One who or that which insulates; specifically, a substance or body that interrupts the communication of electricity or heat to surrounding objects; a non-conductor; anything through which an electric current will not pass.

noun. One who, or that which, insulates.

noun. A substance or object that insulates; a nonconductor.

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 material such as glass or porcelain with negligible electrical or thermal conductivity

"A measure of whether a semiconductor most resembles a conductor or an insulator is given in the band gap - the amount of energy needed to produce moving charge-bearers in the form of electrons and "holes"."

conductor  

petticoat-insulator  pigtail-insulator  shackle-insulator  slot-insulator  strain-insulator  

insulant  insulate  insulation  

material  stuff  

bushing  glass wool  mineral wool  rock wool  

conductivity  ewer  figurine  insulation  interlayer  

insulant  isolation  nonconductor