/ Dictionary / Index M Metal Lumber: Meaning and Definition of Find definitions for: Met'al Lum'ber Pronunciation: [key] a brand of sheet metal pressed and welded together to form joists and studding. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. metallotherapy metallurgy Related Content Daily Word Quiz: fervor Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language