| 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.) |
| 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] |