/ Dictionary / Index M masterstroke: Meaning and Definition of Find definitions for: mas•ter•stroke Pronunciation: (mas'tur-strōk", mä'stur-), [key] — n. a masterly action or achievement; an extremely skillful or effective action: War was avoided by a masterstroke of diplomacy. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: masterstroke (Thesaurus) Masterson masterwork 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