/ Dictionary / Index M Masterson: Meaning and Definition of Find definitions for: Mas•ter•son Pronunciation: (mas'tur-sun, mä'stur-), [key] (“Bat”), 1853–1921, U.S. frontier law officer. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. master-slave manipulator masterstroke Related Content Daily Word Quiz: penchant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language