nonconductor

On this point he remarks that the evil effects of the scale are due to the fact that it is relatively a nonconductor of heat.
Scientific American Supplement, No. 363, December 16, 1882|Various
Paper can be so treated that it will either conduct electricity or become a nonconductor, as may be desired.
Makers of Many Things|Eva March Tappan
Strictly speaking, all substances conduct electricity in some degree, and a nonconductor is merely a bad conductor.
Torpedoes and Torpedo Warfare|C. W. Sleeman
All you have to do is wrap your core with a nonconductor, say nylon thread, and presto, nothing comes out.
Sense from Thought Divide|Mark Irvin Clifton

With an interposed nonconductor none of the chemical power becomes transferable.
Experimental Researches in Electricity, Volume 1|Michael Faraday

British Dictionary definitions for nonconductor

nonconductor

/ (ˌnɒnkənˈdʌktə) /

noun

a substance that is a poor conductor of heat, electricity, or sound

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

nonconductor

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British Dictionary definitions for nonconductor