- 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.
Origin of insulator
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for insulator
Each one that will not make it ring is a poor conductor or an insulator.Common Science
Carleton W. Washburne
It must therefore be considered rather as a partial conductor than as an insulator.On Laboratory Arts
The action of its particles differs from those of an insulator only in degree.Faraday As A Discoverer
The wood is used for posts, cross-ties, wagon hubs, and insulator pins.Studies of Trees
Jacob Joshua Levison
Speaking generally, the conductors are separated by some insulator.Cyclopedia of Telephony & Telegraphy Vol. 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
Word Origin and History for insulator
1801, agent noun in Latin form from insulate.
Online Etymology Dictionary, © 2010 Douglas Harper
- 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.
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.