/ 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: immense Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language