(n.) 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.

conduction conductivity conductor dielectric electric conduction electrode conductance gas conduction grid conductance input conductance insulator ionic conduction liquid conduction metallic conduction mho nonconductor output conductance photoconduction plate conductance semiconductor superconductivity superconductor transfer conductance