insulator definition | Dictionary.com

in⋅su⋅la⋅tor

[in-suh-ley-ter, ins-yuh-]

–noun

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 (v 1.1)
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2006.
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in·su·la·tor (ĭn'sə-lā'tər, ĭns'yə-) Pronunciation Key
n.

A material that insulates, especially a nonconductor of sound, heat, or electricity.
A device that insulates.

The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2006 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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insulator
noun
a material such as glass or porcelain with negligible electrical or thermal conductivity [ant: conductor]

WordNet® 3.0, © 2006 by Princeton University.
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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 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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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.)

[Chapter:] Technology

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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Insulator

In"su*la`tor\, n. 1. One who, or that which, insulates.

2. (Elec. & Thermotics) The substance or body that insulates; a nonconductor.

Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
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