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

  • noun A material that conducts little or no electricity, heat, or sound.

from The Century Dictionary.

  • noun A substance which does not conduct or transmit a particular form of energy (specifically, heat or electricity), or which transmits it with difficulty: thus, wool is a non-conductor of heat; glass and dry wood are non-conductors of electricity. See conductor, 6, electricity, and heat.

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

  • noun (Physics) A substance which does not conduct, that is, convey or transmit, heat, electricity, sound, vibration, or the like, or which transmits them with difficulty; an insulator

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

  • noun any material that does not conduct electricity; a dielectric

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


Sorry, no etymologies found.



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