insulator

[in-suh-ley-ter, ins-yuh-]
noun
  1. Electricity.
    1. a material of such low conductivity that the flow of current through it is negligible.
    2. 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 of insulator

First recorded in 1795–1805; insulate + -or2
Related formsnon·in·su·la·tor, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for insulator

insulator

noun
  1. 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 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for insulator
n.

1801, agent noun in Latin form from insulate.

Online Etymology Dictionary, © 2010 Douglas Harper

insulator in Science

insulator

[ĭnsə-lā′tər]
  1. 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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

insulator in Culture

insulator

A material that does not easily transmit energy, such as electric current (see also current) or heat. Materials such as wood, plastic, and ceramics are insulators. Fiberglass is an example of a heat insulator. (Compare conductor.)

The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.