[dahy-i-lek-trik] Electricity.
a nonconducting substance; insulator.
a substance in which an electric field can be maintained with a minimum loss of power.
of or pertaining to a dielectric substance.

1830–40; di-3 + electric

dielectrically, adverb
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World English Dictionary
dielectric (ˌdaɪɪˈlɛktrɪk)
1.  a substance or medium that can sustain a static electric field within it
2.  a substance or body of very low electrical conductivity; insulator
3.  of, concerned with, or having the properties of a dielectric
[from dia- + electric]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
dielectric   (dī'ĭ-lěk'trĭk)  Pronunciation Key 
Adjective   Having little or no ability to conduct electricity, generally as a result of having no electrons that are free to move.

Noun   A dielectric substance, especially one used in a capacitor to maintain an electric field between the plates.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary
dielectric [(deye-i-lek-trik)]

A material that conducts (see conduction) electricity poorly or not at all. If a voltage is applied to a dielectric, the atoms in the material arrange themselves in such a way as to oppose the flow of electric current. Glass, wood, and plastic are common dielectrics. (See insulator.)

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 device consists of a membrane composed of layers of metal and dielectric insulator, with a pore of few nanometers diameter.
The whole color component of the screen is a three-layer all-metal dielectric stack.
The second is whether there are structures in the body with the required dielectric properties to be susceptible.
High-voltage transformers contain oil as their insulating dielectric.
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