electro-discharge machining

[ ih-lek-troh-dis-chahrj ]
/ ɪˈlɛk troʊˈdɪs tʃɑrdʒ /

noun Metallurgy.

a technique for shaping the surfaces of a metal object by immersing in a dielectric liquid the object and a tool that emits an electric discharge of high current density and short duration.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019