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.

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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020