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mass-produce to manufacture or produce in quantity, esp. in a factory by assembly line methods.
mass production the production, and often packaging, of goods in large quantities by means of machines, standardized design and parts, and, often, assembly lines.
mass spectrograph an early type of mass spectrometer that records photographically rather than electronically.
mass spectrometer an instrument used to determine the mass and abundance of charged particles in a prepared beam, by passing it through an electromagnetic field and electronically recording the distribution of particles, often for the purpose of chemical analysis.
mass transit a system of public transportation that carries people from place to place within a city by bus and train.
mast1 a long, vertical pole that rises from the bottom of a sailing vessel to support the sails and rigging; spar. [2 definitions]
mast2 the fruit of forest trees such as oaks and chestnuts, used to feed animals, esp. pigs.
mastaba an ancient Egyptian tomb, built over a mummy chamber or burial pit, which has a rectangular base, inwardly sloping sides, and a flat roof.
mastectomy the removal of a woman's breast by surgery.
master a person with power or authority; one who rules or controls. [13 definitions]
master-at-arms in the U.S. Navy, a petty officer whose duty is to keep order and maintain discipline on board a ship or at a shore station.
master bedroom in a home with multiple bedrooms, the largest bedroom or one with a special feature such as a fireplace or attached bathroom, usually used by the head or heads of the household.
master builder a skilled building contractor or architect, often the supervisor of construction operations and crew.
master class a small class for very advanced students, esp. a class in musical performance taught by a master musician.
masterful showing expert skill or mastery; authoritative.
master hand an expert. [2 definitions]
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.)