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spark erosion

noun
  1. engineering a method of machining using a shaped electrode which erodes the workpiece by an electric spark discharge between itself and the workpiece
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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