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Mogilev

(Encyclopedia)Mogilev məgēlyôfˈ [key], Belarusian Mahilyow, city (1989 pop. 359,188), capital of Mogilev region, in E Belarus, on the Dnieper River. It is an important rail and highway junction, a river port, a...

Hahn, Otto

(Encyclopedia)Hahn, Otto ôˈtō hän [key], 1879–1968, German chemist and physicist. His important contributions in the field of radioactivity include the discovery of several radioactive substances, the develop...

Ives, Frederic Eugene

(Encyclopedia)Ives, Frederic Eugene, 1856–1937, American inventor, b. Litchfield, Conn. A pioneer in the development of orthochromatic and trichromatic photography and of photoengraving, he followed an earlier su...

denture

(Encyclopedia)denture, artificial replacement for natural teeth and surrounding tissue. Dentures are classified as partial or complete. The former are removable and maintained by clasps, or are fixed bridges with c...

shamrock

(Encyclopedia)shamrock, a plant with leaves composed of three leaflets. According to legend it was used by St. Patrick in explaining the doctrine of the Trinity; it is now used as the emblem of Ireland. An artifici...

Tsiolkovsky, Konstantin Eduardovich

(Encyclopedia)Tsiolkovsky, Konstantin Eduardovich kənstəntyēnˈ ĕdwärˈdəvĭchˈ tsēōlkŏvˈskē [key], 1857–1935, Russian inventor and rocket expert. He lost his hearing in childhood, and, as he could no...

Calumet Harbor

(Encyclopedia)Calumet Harbor, artificial harbor on Lake Michigan, at the mouth of the Calumet River, NE Ill., in S Chicago. The harbor, dredged to 27 ft (8 m), is formed behind a breakwater extending c.2 mi (3.2 km...

buckthorn

(Encyclopedia)buckthorn, common name for some members of the Rhamnaceae, a family of woody shrubs, small trees, and climbing vines widely distributed throughout the world. The buckthorns (several species of the gen...

Low, Frank James

(Encyclopedia)Low, Frank James, 1933–2009, American astronomer and physicist, b. Mobile, Ala., grad. Yale (B.S. 1955), Rice Univ. (M.A. 1957, Ph.D 1959). Low, who worked at Texas Instruments and the National Radi...

Gottwald, Klement

(Encyclopedia)Gottwald, Klement klāməntˈ gôtˈvält [key], 1896–1953, Czechoslovak Communist leader, b. Moravia. After World War I he helped found the Czechoslovak Communist party and served on the party's ce...