Columbia Encyclopedia

Search results

500 results found

entropy

(Encyclopedia)entropy ĕnˈtrəpē [key], quantity specifying the amount of disorder or randomness in a system bearing energy or information. Originally defined in thermodynamics in terms of heat and temperature, e...

espionage

(Encyclopedia)espionage ĕsˈpēənäzhˌ [key], the act of obtaining information clandestinely. The term applies particularly to the act of collecting military, industrial, and political data about one nation for ...

Thomas, Norman Mattoon

(Encyclopedia)Thomas, Norman Mattoon, 1884–1968, American socialist leader, b. Marion, Ohio; grad. Princeton (1905), Union Theological Seminary (1911). He served as pastor of several Presbyterian churches and did...

greenhouse

(Encyclopedia)greenhouse, enclosed glass house used for growing plants in regulated temperatures, humidity, and ventilation. A greenhouse can range from a small room carrying a few plants over the winter, to an imm...

Fair Oaks, American Civil War battle

(Encyclopedia)Fair Oaks: see Peninsular campaign. ...

National Council of the Churches of Christ in the United States of America

(Encyclopedia)National Council of the Churches of Christ in the United States of America, cooperative agency of 35 Protestant, Orthodox, and Anglican denominations. Formed in 1950, with headquarters in New York Cit...

hydrogen peroxide

(Encyclopedia)hydrogen peroxide, chemical compound, H2O2, a colorless, syrupy liquid that is a strong oxidizing agent and, in water solution, a weak acid. It is miscible with cold water and is soluble in alcohol an...

Dionysius the Elder

(Encyclopedia)Dionysius the Elder, c.430–367 b.c., tyrant of Syracuse. Of humble origin, he entered politics as a supporter of the poorer classes. Having prompted (400 b.c.) a measure to elect truly democratic ge...

Dionysius the Younger

(Encyclopedia)Dionysius the Younger, fl. 368–344 b.c., tyrant of Syracuse, son of Dionysius the Elder. He ended the war with Carthage and enlisted the support of the professional army. Neither gifted nor trained ...

Edward the Confessor

(Encyclopedia)Edward the Confessor, d. 1066, king of the English (1042–66), son of Æthelred the Unready and his Norman wife, Emma. After the Danish conquest (1013–16) of England, Edward grew up at the Norman c...