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The following 6 entries include the term of/mass.
center of mass
noun phrase: the point in a body or system of bodies at which the whole mass may be considered as concentrated
conservation of mass
noun phrase: a principle in classical physics: the total mass of any isolated material system is neither increased nor diminished by reactions between the parts
center-of-mass system
noun: a system of polar coordinates used in describing processes involving moving swarms of particles (as cosmic-ray bursts) with the moving common center of mass as origin and the path of that center as polar axis
law of conservation of mass
weapon of mass destruction
noun phrase: a weapon that can destroy entire buildings, cities, etc.
weapons of mass destruction
idiom: weapons that can destroy entire cities, regions, etc.
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Merriam-Webster unabridged
