From The Collaborative International Dictionary of English v.0.48:

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.
   [1913 Webster]
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