the heating of a nonconducting substance caused by dielectric loss when the material is placed in a variable electric field.
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British Dictionary definitions for dielectric heating
a technique in which an insulator is heated by the application of a high-frequency electric field
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