/ Dictionary / Index I impact extrusion: Meaning and Definition of Find definitions for: im'pact extru"sion Pronunciation: [key] — Metalworking. Metalworking. an extrusion process in which a slug of cold metal in a shallow die cavity is formed by the action of a rapidly moving punch that forces the metal through the die or back around the punch. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. impacter impaction Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language