- 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. 2019
- 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
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.
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