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massť a shot in billiards made by hitting the cue ball with the cue held nearly vertically, esp. to make the cue ball curve around another ball that is obstructing an object ball.
masseur a man who provides massages professionally.
masseuse a woman who provides massages professionally.
massif a large mountain mass, often broken up into separate peaks and usu. forming an independent section of a mountain range. [2 definitions]
massive consisting of a very large amount or quantity of matter; big and heavy; solid. [3 definitions]
massless of certain subatomic particles, having no mass, as a photon or gluon.
mass media those means or instruments of communication that reach large numbers of people, such as newspapers, magazines, television, and radio.
mass meeting a large public meeting, called to discuss some matter of common concern or interest.
mass noun a noun that denotes an abstract, uncountable entity and is not preceded by "a" or "an," such as "integrity," "filth," or "information".
mass number the total number of neutrons and protons in the nucleus of an atom.
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.