Breadcrumb Home > Dictionary > Index A arch beam: Meaning and Definition of Find definitions for: arch' beam" Pronunciation: [key] a crowned metal beam, as of the deck of a ship. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. archbanc archbishop ✖ Related Content Daily Word Quiz: acronym Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language