/ Dictionary / Index M mast ball: Meaning and Definition of Find definitions for: mast' ball" Pronunciation: [key] an ornamental ball forming the truck of a mast. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. mastax mast band Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language