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Machaut, Guillaume de

(Encyclopedia)Machaut, Guillaume de gēyōmˈ də mäshōˈ [key], c.1300–1377, French poet and composer. Variants of his name include Machault, de Machaudio, and de Mascaudio. He studied theology and took holy o...

iceberg

(Encyclopedia)iceberg, mass of ice that has become detached, or calved, from the edge of an ice sheet or glacier and is floating on the ocean. Because ice is slightly less dense than water about one ninth of the to...

chain reaction

(Encyclopedia)CE5 Chain reaction: A neutron (n) strikes the uranium nucleus (U-235), causing it to split into fission products A and B and release two neutrons. These neutrons can in turn cause further fissions....

isotope

(Encyclopedia)CE5 Isotopes of hydrogen isotope īˈsətōp [key], in chemistry and physics, one of two or more atoms having the same atomic number but differing in atomic weight and mass number. The concept of ...

bohrium

(Encyclopedia)bohrium bôrˈēəm [key], artificially produced radioactive chemical element; symbol Bh; at. no. 107; mass number of most stable isotope 270; m.p., b.p., sp. gr., and valence unknown. Situated in Gro...

matter

(Encyclopedia)matter, anything that has mass and occupies space. Matter is sometimes called koinomatter (Gr. koinos=common) to distinguish it from antimatter, or matter composed of antiparticles. The atomic th...

newton, unit of measure

(Encyclopedia)newton, abbr. N, unit of force in the mks system of units, which is based on the metric system; it is the force that produces an acceleration of 1 meter per second per second when exerted on a mass of...

Middleboro

(Encyclopedia)Middleboro, town (1990 pop. 17,867), Plymouth co., SE Mass.; inc. 1669. Cranberry-processing is a major industry in the town, and fire apparatus, chemicals, and shoes are manufactured. The town was de...

Miller, William

(Encyclopedia)Miller, William, 1782–1849, American sectarian leader, b. Pittsfield, Mass. He was the founder of the sect of Second Adventists, sometimes called Millerites. In 1831, convinced from study of the Bib...

Atkinson, Brooks

(Encyclopedia)Atkinson, Brooks (Justin Brooks Atkinson), 1894–1984, American journalist, b. Melrose, Mass. After being an editor for the New York Times he became its drama critic in 1925. Except for his service a...