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A material that conducts little or no electricity, heat, or sound.
(General Physics) a substance that is a poor conductor of heat, electricity, or sound
non•con•duc•tor(ˌnɒn kənˈdʌk tər)
a substance that does not readily conduct heat, sound, or electricity.
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|Noun||1.||nonconductor - a material such as glass or porcelain with negligible electrical or thermal conductivity|
bushing - an insulating liner in an opening through which conductors pass
material, stuff - the tangible substance that goes into the makeup of a physical object; "coal is a hard black material"; "wheat is the stuff they use to make bread"
glass wool - glass fibers spun and massed into bundles resembling wool