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meetinghouse a building, assembly hall, or house used for public meetings or worship, esp. by Quakers.
mega- large; great. [2 definitions]
megabuck (informal) one million dollars. [2 definitions]
megabyte a unit of electronic memory capacity equal to 1,048,576 bytes, or approximately one million bytes.
megacycle see megahertz.
megadeath a million dead people, as in a nuclear explosion.
megahertz a unit of frequency equal to one million cycles per second or one million hertz. (abbr.: MHz)
megalith a huge stone, esp. one used in prehistoric times as a monument.
megalo- huge; gigantic; too large.
megalomania a mental disorder characterized by delusions of power, wealth, or importance. [2 definitions]
megalopolis an extremely large city or a large, densely populated region surrounding and including such a city.
megalosaur any of a genus of huge carnivorous dinosaurs.
megaphone a hand-held, funnel-shaped device used to amplify and direct the sound of a voice.
megaton a unit of power used in measuring the force of nuclear weapons, equal to the explosive force of a million tons of TNT.
megawatt unit of power equal to one million watts.
Meiji the name given to the reign of Emperor Mutsuhito of Japan, who ruled from 1867 to 1912.
Meiji Restoration a period in Japanese history that is characterized by the downfall of feudalism and the opening of Japan to trade and diplomatic relations with the West.
meiosis the process in which the diploid chromosomes of a cell are replicated once, followed by two divisions of the nucleus, to give rise to four haploid cells that may develop into gametes or spores.
Meistersinger a member of a medieval German guild organized for the cultivation of music and poetry.
Mekong a major river originating in China and flowing southeast through Myanmar, Laos, Thailand, Cambodia, and Vietnam.
Mekong Delta an expansive delta region formed by the Mekong River in southeast Vietnam, whose wetlands make it a major rice producer. The Mekong Delta was a scene of heavy combat between U.S. and Viet Cong troops during the Viet Nam War.