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insulator

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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 + -or 2
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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in·su·la·tor   (ĭn'sə-lā'tər, ĭns'yə-)   
n.  
  1. A material that insulates, especially a nonconductor of sound, heat, or electricity.

  2. A device that insulates.

The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Cultural Dictionary

insulator

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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Medical Dictionary

Main Entry: in·su·la·tor
Pronunciation: 'in(t)-s&-"lAt-&r
Function: noun
: a material that is used to provide insulation;also : a device made of such material
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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