Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

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

from Wiktionary, Creative Commons Attribution/Share-Alike License

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

from the GNU version of the Collaborative International Dictionary of English

  • n. One who, or that which, insulates.
  • n. A substance or object that insulates; a nonconductor.

from The Century Dictionary and Cyclopedia

  • n. 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 WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

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

Etymologies

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

Examples

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