Definify.com
Webster 1913 Edition
Nonconductor
Nonˊcon-duct′or
,Noun.
(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.