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naval conferences

(Encyclopedia)naval conferences, series of international assemblies, meeting to consider limitation of naval armaments, settlement of the rules of naval war, and allied issues. The London Naval Conference (1908–9...

hypersensitivity

(Encyclopedia)hypersensitivity, heightened response in a body tissue to an antigen or foreign substance. The body normally responds to an antigen by producing specific antibodies against it. The antibodies impart i...

chemical warfare

(Encyclopedia)chemical warfare, employment in war of incendiaries, poison gases, and other chemical substances. Ancient armies attacking or defending fortified cities threw burning oil and fireballs. A primitive ty...

Iran-Iraq War

(Encyclopedia)Iran-Iraq War, 1980–88, protracted military conflict between Iran and Iraq. It officially began on Sept. 22, 1980, with an Iraqi land and air invasion of western Iran, although Iraqi spokespersons m...

Mancini, Laura, duchesse de Mercœur

(Encyclopedia)Mancini, Laura, duchesse de Mercœur märēˈ än, bo͞oyôN [key], 1649–1714, was famous for her vivacity and wit. She became the center of a literary circle in Paris and was the patroness of La Fo...

plutonium

(Encyclopedia)plutonium plo͞otōˈnēəm [key], radioactive chemical element; symbol Pu; at. no. 94; mass no. of most stable isotope 244; m.p. 641℃; b.p. 3,232℃; sp. gr. 19.84 at 20℃; valence +3, +4, +5, or ...

Borgia, Cesare

(Encyclopedia)Borgia, Cesare or Caesar bōrˈjä [key], 1476–1507, Italian soldier and politician, younger son of Pope Alexander VI and an outstanding figure of the Italian Renaissance. Throughout his pontificat...

catfish

(Encyclopedia)catfish, common name applied to members of the fish families constituting the order Siluriformes, found in fresh and coastal waters. Catfish are named for the barbels (“whiskers”) around their mou...

euthanasia

(Encyclopedia)euthanasia yo͞oˌthənāˈzhə [key], either painlessly putting to death or failing to prevent death from natural causes in cases of terminal illness or irreversible coma. The term comes from the Gre...

coral reefs

(Encyclopedia)coral reefs, limestone formations produced by living organisms, found in shallow, tropical marine waters. In most reefs, the predominant organisms are stony corals, colonial cnidarians that secrete an...