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Nonconductor
Nonconductor Non`con*duct"or, n. (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.
Meaning of Nonconductor from wikipedia