nonconductor Meaning, Definition & Usage

  1. noun a material such as glass or porcelain with negligible electrical or thermal conductivity
    dielectric; insulator.

WordNet

Non`con*duct"or noun
Definitions
  1. (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.

Webster 1913