/ Dictionary / Index M mushroom slab construction: Meaning and Definition of Find definitions for: mush'room slab" construc"tion Pronunciation: [key] beamless reinforced-concrete floor and roof construction employing columns with widely flaring heads having horizontal rings of reinforcement to support the floor or roof slab. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. mushroom cloud mushroom ventilator Related Content Daily Word Quiz: nonchalant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language