You searched for: “electric discharge machining
electric-discharge machining
A metal-cutting process in which high-frequency discharges from a negatively charged metal tool remove metal from the work piece by electroerosion.

There is no electrolyte, but the work is submerged in oil to flush away eroded particles and to delay each spark until peak energy is built up.>

This entry is located in the following unit: electro-, electr-, electri- (page 21)