nonconductor

[non-kuhn-duhk-ter]
noun
a substance that does not readily conduct heat, sound, or electricity.

Origin:
1745–55; non- + conductor

nonconducting, adjective
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World English Dictionary
nonconductor (ˌnɒnkənˈdʌktə)
 
n
a substance that is a poor conductor of heat, electricity, or sound

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
To alter the normal current distribution on an anode or cathode by the interposition of a nonconductor.
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