insulator

[in-suh-ley-ter, ins-yuh-]
noun
1.
Electricity.
a.
a material of such low conductivity that the flow of current through it is negligible.
b.
insulating material, often glass or porcelain, in a unit form designed so as to support a charged conductor and electrically isolate it.
2.
a person or thing that insulates.

Origin:
1795–1805; insulate + -or2

noninsulator, noun
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
insulator (ˈɪnsjʊˌleɪtə)
 
n
any material or device that insulates, esp a material with a very low electrical conductivity or thermal conductivity or something made of such a material

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
insulator   (ĭn'sə-lā'tər)  Pronunciation Key 
A material or an object that does not easily allow heat, electricity, light, or sound to pass through it. Air, cloth and rubber are good electrical insulators; feathers and wool make good thermal insulators. Compare conductor.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary

insulator definition


A material that does not easily transmit energy, such as electric current or heat. Materials such as wood, plastic, and ceramics are insulators. Fiberglass is an example of a heat insulator. (Compare conductor.)

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
The dipped-fabric layers act as the conductors while the undipped fabric forms
  the insulator.
It's also, among other things, an extremely good acoustic insulator and
  virtually transparent.
It has a poor blood supply, which makes it an excellent insulator.
Operating on the principle of thermodynamics, the hay acts as an insulator and
  the retained heat slowly cooks the food.
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