/ Dictionary / Index M mast bed: Meaning and Definition of Find definitions for: mast' bed" Pronunciation: [key] a construction in a wooden deck around the opening for a mast. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. mast band mast cell Related Content Daily Word Quiz: exemplary Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language