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varicose vein

(Encyclopedia)varicose vein, superficial vessel that is abnormally lengthened, twisted, or dilated, seen most often on the legs and thighs. Varicose veins develop spontaneously, and are usually attributed to a here...

Wyeth, Nathaniel Jarvis

(Encyclopedia)Wyeth, Nathaniel Jarvis, 1802–56, American explorer and trader in the far West, b. Cambridge, Mass. A businessman in Boston, he was fired with a desire to go to Oregon by the eloquence of Hall J. Ke...

speedometer

(Encyclopedia)speedometer, instrument that indicates speed. A cable from an automotive speedometer is attached to the rear of the transmission of an automobile; the cable turns at a rate proportional to the speed o...

Nelson, Horatio Nelson, Viscount

(Encyclopedia)Nelson, Horatio Nelson, Viscount, 1758–1805, British admiral. The most famous of Britain's naval heroes, he is commemorated by the celebrated Nelson Column in Trafalgar Square, London. Upon the ...

mine, in warfare

(Encyclopedia)mine, in warfare, term formerly applied to a system of tunnels dug under an army fortification and ending in a chamber where either explosives were placed to be detonated at a chosen moment or the sup...

Libertyville

(Encyclopedia)Libertyville, village (1990 pop. 19,174), Lake co., NE Ill., in a lake area; inc. 1882. Paper products and electronic equipment are made. Adlai E. Stevenson had a home there. A naval training station ...

Joint Base Andrews

(Encyclopedia)Joint Base Andrews, officially Joint Base Andrews Naval Air Facility Washington, formerly Andrews Air Force Base, U.S. military installation, 4,279 acres (1,732 hectares), central Md., est. 1943. It i...

Jarvis, John Wesley

(Encyclopedia)Jarvis, John Wesley, 1781?–1839, American portrait painter, b. England. Beginning as an engraver in Philadelphia, he early moved to New York, where he became a popular portrait painter. In City Hall...

Yalta Conference

(Encyclopedia)Yalta Conference, meeting (Feb. 4–11, 1945), at Yalta, Crimea, USSR, of British Prime Minister Winston Churchill, U.S. President Franklin Delano Roosevelt, and Soviet Premier Joseph Stalin. Most of ...

distillation

(Encyclopedia)distillation, process used to separate the substances composing a mixture. It involves a change of state, as of liquid to gas, and subsequent condensation. The process was probably first used in the p...