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Fermat, Pierre de

(Encyclopedia)Fermat, Pierre de pyĕr də fĕrmäˈ [key], 1601–65, French mathematician. A magistrate whose avocation was mathematics, Fermat is known as a founder of modern number theory and probability theory....

Tonti, Henri de

(Encyclopedia)Tonti or Tonty, Henri de both: äNrēˈ də tôNtēˈ [key], c.1650–1704, French explorer in North America, b. Italy. Serving in the French army, he lost a hand in battle; his skillful use of the ap...

Saint-Simon, Claude Henri de Rouvroy, comte de

(Encyclopedia)Saint-Simon, Claude Henri de Rouvroy, comte de klōd äNrē də ro͞ovrwäˈ kôNt də săN-sēmôNˈ [key], 1760–1825, French social philosopher; grand nephew of Louis de Rouvroy, duc de Saint-Simo...

Condillac, Étienne Bonnot de

(Encyclopedia)Condillac, Étienne Bonnot de ātyĕnˈ bônōˈ də kôNdēyäkˈ [key], 1715–80, French philosopher who developed the theory of sensationalism (i.e., that all knowledge comes from the senses and t...

De Pere

(Encyclopedia)De Pere dĭ pēr [key], city (2020 pop. 25,410), Brown co., E central Wis., on the Fox River;...

Iturbide, Agustín de

(Encyclopedia)Iturbide, Agustín de ägo͞ostēnˈ dā ēto͞orbēˈᵺā [key], 1783–1824, Mexican revolutionist, emperor of Mexico (1822–23). An officer in the royalist army, he was sympathetic to independenc...

De Long, George Washington

(Encyclopedia)De Long, George Washington də lôngˈ [key], 1844–81, American arctic explorer, b. New York City, grad. Annapolis, 1865. In 1873 he was assigned to the Juniata, which was sent to the arctic to sear...

De-shima

(Encyclopedia)De-shima dāˈ-jĭmä [key], artificial island, c.40 acres (16 hectares), Nagasaki prefecture, W Kyushu, Japan, in Nagasaki harbor. It has many docks and is connected by bridge to the city of Nagasaki...

De Lancey

(Encyclopedia)De Lancey də lănˈsē [key], family of political leaders, soldiers, and merchants prominent in colonial New York. Étienne De Lancey or Stephen De Lancey, 1663–1741, b. Caen, France, was among the...