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insupportable
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insulator
in·su·la·tor [ ínssə làytər, ínssyə làytər ] (plural in·su·la·tors)


noun 
Definition:
 
something providing insulation: a material or device that prevents or reduces the passage of heat, electricity, or sound
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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