nonconductor
non·con·duc·tor
noun
1.
a material such as glass or porcelain with negligible electrical or thermal conductivity
Origin
From non- + conductor.
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WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.