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blackbody

(Encyclopedia)blackbody, in physics, an ideal black substance that absorbs all and reflects none of the radiant energy falling on it. Lampblack, or powdered carbon, which reflects less than 2% of the radiation fall...

Tecumseh

(Encyclopedia)Tecumseh tĭkŭmˈsē [key], 1768?–1813, chief of the Shawnee, b. probably in Clark co., Ohio. Among his people he became distinguished for his prowess in battle, but he opposed the practice of tort...

Spencer, Herbert

(Encyclopedia)Spencer, Herbert, 1820–1903, English philosopher, b. Derby. In 1848 he moved to London, where he was an editor at The Economist and wrote his first major book, Social Statics (1851), which tried to ...

Root, Elihu

(Encyclopedia)Root, Elihu, 1845–1937, American cabinet member and diplomat, b. Clinton, N.Y. Admitted to the bar in 1867, he practiced law in New York City, became prominent in Republican politics, and was appoin...

Clark, Ramsey

(Encyclopedia)Clark, William Ramsey, 1927–2021, attorney general of the United States (1967–69), b. Dallas, Tex., Univ. of Texas-Austin (BA, 1949), Univ. of Chica...

hygrometer

(Encyclopedia)hygrometer hīgrŏmˈətər [key], instrument used to measure the moisture content of a gas, as in determining the relative humidity of air. The temperature at which dew or frost forms is a measure of...

Ghose, Aurobindo

(Encyclopedia)Ghose, Aurobindo ôrōbĭnˈdō gōsh [key], 1872–1950, Indian nationalist leader and mystic philosopher. Born in Bengal, he was sent to England and lived there for 14 years, completing his educatio...

genocide

(Encyclopedia)genocide, in international law, the intentional and systematic destruction, wholly or in part, by a government of a national, racial, religious, or ethnic group. Although the term genocide was first c...

MacMahon, Marie Edmé Patrice de

(Encyclopedia)MacMahon, Marie Edmé Patrice de märēˈ ĕdmāˈ pätrēsˈ də mäkmäōNˈ [key], 1808–93, president of the French republic (1873–79), marshal of France. MacMahon, of Irish descent, fought in ...

William of Occam

(Encyclopedia)William of Occam or Ockham both: ŏkˈəm [key], c.1285–c.1349, English scholastic philosopher. A Franciscan, Occam studied and taught at Oxford from c.1310 until 1324, when he was summoned to the p...