/ Dictionary / Index W wall box: Meaning and Definition of Find definitions for: wall' box" Pronunciation: [key] — Building Trades. Building Trades. an enclosed iron or steel socket built into a masonry wall to support the end of a wooden beam. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. wallboard wallcovering Related Content Daily Word Quiz: modify Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language