NONCONDUCTOR

insulator, dielectric, nonconductor

(noun) a material such as glass or porcelain with negligible electrical or thermal conductivity

Source: WordNet® 3.1

Etymology

Noun

nonconductor (countable and uncountable, plural nonconductors)

any material that does not conduct electricity; a dielectric

Source: Wiktionary

Non`con*duct"or, n. (Physics)

Definition: 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.

Source: Webster’s Unabridged Dictionary 1913 Edition