• WordNet 3.6
    • n nonconductor a material such as glass or porcelain with negligible electrical or thermal conductivity
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Webster's Revised Unabridged Dictionary
    • n Nonconductor (Physics) A substance which does not conduct, that is, convey or transmit, heat, electricity, sound, vibration, or the like, or which transmits them with difficulty; an insulator; as, wool is a nonconductor of heat; glass and dry wood are nonconductors of electricity.
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Century Dictionary and Cyclopedia
    • n nonconductor A substance which does not conduct or transmit a particular form of energy (specifically, heat or electricity), or which transmits it with difficulty: thus, wool is a non-conductor of heat; glass and dry wood are non-conductors of electricity. See conductor, 6, electricity, and heat.
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In literature:

She had said more to Miss Nugent, but Mary was a nonconductor.
"Nuttie's Father" by Charlotte M. Yonge
With an interposed nonconductor none of the chemical power becomes transferable.
"Experimental Researches in Electricity, Volume 1" by Michael Faraday
The Mantis has outstripped humanity in her knowledge of thermic nonconductors or insulators.
"Social Life in the Insect World" by J. H. Fabre
Zinc is the best nonconductor of heat that I know of.
"Doctor Jones' Picnic" by S. E. Chapman
Paper can be so treated that it will either conduct electricity or become a nonconductor, as may be desired.
"Makers of Many Things" by Eva March Tappan
As is well known, gases under ordinary conditions are nonconductors.
"A History of Science, Volume 5(of 5)" by Henry Smith Williams