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technetium

(Encyclopedia)technetium tĕknēˈshēəm [key] [Gr. technetos=artificial], artificially produced radioactive chemical element; symbol Tc; at. no. 43; mass no. of most stable isotope 98; m.p. 2,200℃; b.p. 4,877�...

moscovium

(Encyclopedia)moscovium mŏskōˈvēəm [key], artificially produced radioactive chemical element; symbol Mc; at. no. 115; mass number of most stable isotope 288; m.p., b.p., sp. gr., and valence unknown. Situated ...

water power

(Encyclopedia)water power, mechanical energy derived from falling or flowing water, e.g., rivers, streams, and the overflow of dams. The wooden water wheel, long utilized for driving machinery in flour mills and fa...

transuranium elements

(Encyclopedia)transuranium elements, in chemistry, radioactive elements with atomic numbers greater than that of uranium (at. no. 92). All the transuranium elements of the actinide series were discovered as synthet...

Ontario, province, Canada

(Encyclopedia)CE5 Ontario ŏntârˈēō [key], province (2001 pop. 11,410,046), 412,582 sq mi (1,068,587 sq km), E central Canada. Before the arrival of Europeans the Ontario region was inhabited by several Al...

Hejaz

(Encyclopedia)Hejaz or Hedjaz both: hējăzˈ, hĕjäzˈ [key], region, c.150,000 sq mi (388,500 sq km), NW Saudi Arabia, on the Gulf of Aqaba and the Red Sea. Mecca is the chief city. Extending S to Asir, Hejaz is...

Erie, Lake

(Encyclopedia)Erie, Lake, 9,940 sq mi (25,745 sq km), 241 mi (388 km) long and from 30 to 57 mi (48–92 km) wide, bordered on the N by S Ont., Canada, on the E by W N.Y., on the S by NW Pa. and N Ohio, and on the ...

Doctorow, E. L.

(Encyclopedia)Doctorow, E. L. (Edgar Lawrence Doctorow) dŏkˈtərōˌ [key], 1931–2015, American novelist, b. New York City. The author of a dozen novels, Doctorow is known for his skillful blending of fiction a...

Cistercians

(Encyclopedia)Cistercians sĭstrˈshənz [key], monks of a Roman Catholic religious order founded (1098) by St. Robert, abbot of Molesme, in Cîteaux [Cistercium], Côte-d'Or dept., France. They reacted against Clu...

Seaborg, Glenn Theodore

(Encyclopedia)Seaborg, Glenn Theodore sēˈbôrg [key], 1912–99, American chemist, b. Ishpeming, Mich., grad. Univ. of California at Los Angeles, 1934, Ph.D. Univ. of California at Berkeley, 1937. In 1939, he beg...