Breadcrumb Home > Dictionary > Index A arb: Meaning and Definition of Find definitions for: arb Pronunciation: (ärb), [key] an arbitrager. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: arb (Thesaurus) Araxes arba kanfoth* ✖ Related Content Daily Word Quiz: deracinate Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language