in·su·la·tor

[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

non·in·su·la·tor, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
insulator (ˈɪnsjʊˌleɪtə) [Click for IPA pronunciation guide]
 
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
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Insulator is always a great word to know.
So is bezoar. Does it mean:
a scrap or morsel of food left at a meal.
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
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.
Cite This Source
Example sentences
Snow banked over the covered laid down branches worked as a temperature
  changing insulator also.
It's also, among other things, an extremely good acoustic insulator and
  virtually transparent.
Generally, this is a job for a professional insulator.
It can survive exposure to a vacuum, and it seems to be an insulator-which is
  why the researchers have chosen it.
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