/ Dictionary / Index I impacter: Meaning and Definition of Find definitions for: im•pact•er Pronunciation: (im-pak'tur), [key] — n. a person or thing that impacts. See Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. impacted impact extrusion Related Content Daily Word Quiz: acquiesce Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language