/ Dictionary / Index A antitruster: Meaning and Definition of Find definitions for: an•ti•trust•er Pronunciation: (an"tē-trus'tur, an"tī-), [key] — n. Informal. a person who opposes business trusts and favors unrestrained competition among businesses. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: antitruster (Thesaurus) antitrust antitussive Related Content Daily Word Quiz: respite Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language