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master key a key that will open all the locks in a given set, though the keys to these locks are not alike.
masterly befitting or worthy of a master.
master mechanic a highly skilled mechanic, esp. one who supervises other mechanics.
mastermind to cleverly plan and supervise the development of. [2 definitions]
Master of Arts a graduate degree, below that of doctor, that is given by a college or university to a person who has completed a prescribed course of graduate study in the humanities or social sciences; master's degree. (abbr.: M.A.)
master of ceremonies one who hosts a formal event or entertainment, usu. making speeches or announcing guests; emcee.
Master of Science a master's degree awarded usu. in science, technology, or mathematics. (abbr.: M.S.)
masterpiece a work of art of the highest quality. [2 definitions]
master's degree a degree that you get after finishing an advanced program of study at a college or university.
master sergeant in the U.S. military, a noncommissioned officer of high rank, second only to the rank of sergeant major.
mastership the state of being a master; authority; control. [3 definitions]
masterstroke an extremely clever or skillful action or accomplishment.
masterwork an art work of the finest quality; masterpiece.
mastery the qualities of skill, knowledge, and expertise. [3 definitions]
masthead the top of a ship's mast. [2 definitions]
mastic an aromatic gum or resin from the bark of a small evergreen tree of the Mediterranean region, used as an astringent and an ingredient in varnish. [3 definitions]
masticate to grind (food) with the teeth; chew. [2 definitions]
masticatory of, relating to, or used in mastication; adapted for chewing. [2 definitions]
mastiff one of a breed of large, strong dogs that have a short, light brown coat and are often used as watchdogs.
mastitis an inflammation of the breast or udder.
masto- breast.