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stimulant

(Encyclopedia)stimulant, any substance that causes an increase in activity in various parts of the nervous system or directly increases muscle activity. Cerebral, or psychic, stimulants act on the central nervous s...

steam engine

(Encyclopedia)CE5 Steam engine steam engine, machine for converting heat energy into mechanical energy using steam as a medium, or working fluid. When water is converted into steam it expands, its volume increa...

Duvalier, Jean-Claude

(Encyclopedia)Duvalier, Jean-Claude düvälyāˈ [key], 1951–2014, president of Haiti (1971–86). At age 19, he was proclaimed “president for life” upon the death of his father, Francois Duvalier. Under gre...

Eagleton, Thomas Francis

(Encyclopedia)Eagleton, Thomas Francis, 1929–2007, U.S. senator (1968–87), b. St. Louis, Mo. Admitted to the bar in 1953, he entered Democratic politics in Missouri and served as circuit attorney for St. Louis ...

Alexander, prince of Serbia

(Encyclopedia)Alexander (Alexander Karadjordjević) kărəjôrˈjəvĭch [key], 1806–85, prince of Serbia (1842–58), son of Karageorge (Karadjordje). He was elected to succeed the deposed Michael of Serbia. Wea...

Eshkol, Levi

(Encyclopedia)Eshkol, Levi lāˈvē ĕshˈkôl [key], 1895–1969, Israeli statesman, third prime minister of Israel, b. Ukraine; originally named Levi Shkolnik. In World War I he served in the Jewish Legion, which...

Fernández Reyna, Leonel Antonio

(Encyclopedia)Fernández Reyna, Leonel Antonio, 1953–, Dominican political leader, president of the Dominican Republic (1996–2000, 2004–12), b. Santo Domingo. He spent his childhood in New York City and later...

isopleth

(Encyclopedia)isopleth īˈsəplĕthˌ [key], line drawn on a map through all points of equal value of some measurable quantity. In many meteorologic, oceanographic, or geologic studies some physical or chemical pr...

Gregory XII

(Encyclopedia)Gregory XII, c.1327–1417, pope (1406–15), a Venetian named Angelo Correr; successor of Innocent VII. As a condition of election, Gregory promised to do everything possible to end the Great Schism,...

epinephrine

(Encyclopedia)epinephrine ĕpˌənĕfˈrīn [key], hormone important to the body's metabolism, also known as adrenaline. Epinephrine, a catecholamine, together with norepinephrine, is secreted principally by the me...