nonconductor

[ non-kuh n-duhk-ter ]

/ ˌnɒn kənˈdʌk tər /

a substance that does not readily conduct heat, sound, or electricity.

Origin of nonconductor

First recorded in 1745–55; non- + conductor

non·con·duct·ing, adjective

Emerson, in perfect agreement with this estimate says, "Her pen was a non-conductor."

Daughters of the Puritans |Seth Curtis Beach
Of course, it will be understood that the leather is a non-conductor of electricity.

The Boy Spy |Joseph Kerby
A charged conductor supported on a non-conductor retains its charge.

Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3 |Various
As the water cannot then flow, your finger is what we will call a non-conductor and the water will be retained in the pipe.

ABC of Electricity |William Henry Meadowcroft

Because the flannel, being a non-conductor, prevents the external heat from dissolving the ice.

The Reason Why |Anonymous

nonconductor

/ (ˌnɒnkənˈdʌktə) /

a substance that is a poor conductor of heat, electricity, or sound