from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A material that insulates, especially a nonconductor of sound, heat, or electricity.
  • noun A device that insulates.

from The Century Dictionary.

  • noun One who or that which insulates; specifically, a substance or body that interrupts the communication of electricity or heat to surrounding objects; a non-conductor; anything through which an electric current will not pass.

from the GNU version of the Collaborative International Dictionary of English.

  • noun One who, or that which, insulates.
  • noun (Elec. & Thermotics) A substance or object that insulates; a nonconductor.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun A substance that does not transmit heat (thermal insulator), sound (acoustic insulator) or electricity (electrical insulator).
  • noun A non-conductive structure, coating or device that does not transmit sound, heat or electricity (see image)

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun a material such as glass or porcelain with negligible electrical or thermal conductivity


from Wiktionary, Creative Commons Attribution/Share-Alike License

From insulate 'to isolate' (itself from Latin insula 'island') + suffix -or



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