01 n. A substance which does not conduct, that is, convey or transmit, heat, electricity, sound, vibration, or the like, or which transmits them …
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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.(Physics)