nonconductor
n 1: a material such as glass or porcelain with negligible
electrical or thermal conductivity [syn: {insulator},
{dielectric}, {nonconductor}] [ant: {conductor}]
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]