/ Dictionary / Index M mast house: Meaning and Definition of Find definitions for: mast' house" Pronunciation: [key] a deckhouse built around a mast as a platform for cargo-handling machinery, gear, and controls. (formerly) a towerlike crane for stepping and removing masts from ships or boats. a building in which masts are made. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. masthead mastic Related Content Daily Word Quiz: censure Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language