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Mayflower, ship

(Encyclopedia)Mayflower, ship that in 1620 brought the Pilgrims from England to New England. She set out from Southampton in company with the Speedwell, the vessel that had borne some of the English separatists fro...

Lord's Supper

(Encyclopedia)Lord's Supper, Protestant rite commemorating the Last Supper. In the Reformation the leaders generally rejected the traditional belief in the sacrament as a sacrifice and as an invisible miracle of th...

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...

alpha particle

(Encyclopedia)alpha particle, one of the three types of radiation resulting from natural radioactivity. Alpha radiation (or alpha rays) was distinguished and named by E. R. Rutherford in 1909, who found by measurin...

deuterium

(Encyclopedia)deuterium do͞otērˈēəm [key], isotope of hydrogen with mass no. 2. The deuterium nucleus, called a deuteron, contains one proton and one neutron. Deuterium is also called heavy hydrogen, and water...

Dunstable, John

(Encyclopedia)Dunstable, John dŭnˈstəbəl [key], c.1385–1453, English composer. Dunstable is thought to have accompanied his patron, the duke of Bedford, to France. About 60 of his works—nearly all sacred pi...

Falmouth, town, United States

(Encyclopedia)Falmouth, town (2020 pop. 32,517), Barnstable co., SE Mass., on Cape Cod; settled c.1660, inc. 1686. Once a whaling and boatbuilding center, the town ha...