a material of such low conductivity that the flow of current through it is negligible.
insulating material, often glass or porcelain, in a unit form designed so as to support a charged conductor and electrically isolate it.
a person or thing that insulates.
- non·in·su·la·tor, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use insulator in a sentence
The synthetic fiber insulation comes close to the weight and packability of down, and its fibers contain Aerogel, a very porous, very light material that’s one of the best insulators ever created.
If that sounds like a strange direction to go down, it isn’t—a material that’s a terrible heat conductor could make a superb insulator, and materials like it could play a key role in bringing the world to net-zero greenhouse gas emissions.The world’s worst conductor could be a game changer in the climate crisis | Claire Maldarelli | July 23, 2021 | Popular-Science
An insulator is a material that doesn’t transmit energy easily.
Wool not only makes for great performance wear, but it’s also the ideal camper insulator for its ability to retain warmth, reduce energy loss and noise, and resist mold and mildew.
It’s very light, can absorb immense heat, and is an effective insulator.‘7 Minutes of Terror’: The Technology Perseverance Will Need to Survive Landing on Mars | Chris James | February 18, 2021 | Singularity Hub
The sheath surrounding the nerves acts as an electrical insulator, increasing neural speed by 100-fold.
It was more than a question of finding the perfect electrical insulator, though that would be handy too.Security | Poul William Anderson
A wire was led through an insulator, so that the stream of electricity could be subjected to experiment in the Hut.The Home of the Blizzard | Douglas Mawson
The insulators are of glass, protected by a wooden shield, of the pattern known as the Wade insulator.
For the insulation of the wires he recommended gutta-percha, which was then becoming known as an insulator.Heroes of the Telegraph | J. Munro
In 1854 he introduced the pneumatic dispatch into London, and, in 1856, he patented his well-known double-cup insulator.Heroes of the Telegraph | J. Munro
British Dictionary definitions for insulator
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
Scientific definitions for insulator
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.
Cultural definitions for insulator
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.