Children's, Intermediate and Advanced Online English Dictionary & Thesaurus

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air mass a body of air that covers a wide area and has little horizontal variation in temperature, pressure, or moisture.
atomic mass unit a unit equal to one twelfth of the mass of an atom of the most abundant kind of carbon, equal to 1.6605 times 1024 gram.
critical mass the minimum mass of fissionable material necessary to sustain a nuclear chain reaction. [2 definitions]
High Mass a Catholic mass in which parts of the text are sung by the celebrant, often with additional music, incense, and ceremony. (Cf. Low Mass.)
Low Mass a mass that is recited, rather than sung, by one priest assisted by one acolyte.
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 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.
mass-produce to manufacture or produce in quantity, esp. in a factory by assembly line methods.
rest mass the mass of a body when at rest.