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

1795–1805; insulate + -or2

noninsulator, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
insulator (ˈɪnsjʊˌleɪtə)
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
But snow pack and other natural insulators can keep the frogs sufficiently warm
  during their winter hibernation.
The transistors are sandwiches of metals and insulators that must be laid down
  on a flat surface, which produces a rigid display.
Two strands of two millimeter galvanized wire, the top one indicated by the
  insulators on every tree, was the hot one.
In this case, officials say soot from nearby fires collected on the insulators.
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