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coral reefs

(Encyclopedia)coral reefs, limestone formations produced by living organisms, found in shallow, tropical marine waters. In most reefs, the predominant organisms are stony corals, colonial cnidarians that secrete an...

ethanol

(Encyclopedia)ethanol ĕthˈənōlˌ [key] or ethyl alcohol, CH3CH2OH, a colorless liquid with characteristic odor and taste; commonly called grain alcohol or simply alcohol. Ethanol is used extensively as a solv...

San Diego

(Encyclopedia)San Diego săn dēāˈgō [key], city (1990 pop. 1,110,549), seat of San Diego co., S Calif., on San Diego Bay; inc. 1850. San Diego includes the unincorporated communities of La Jolla and Spring Vall...

Oxford, University of

(Encyclopedia)Oxford, University of, at Oxford, England, one of the oldest English-language universities in the world. The university was a leading center of learning throughout the Middle Ages; such scholars as Ro...

personality

(Encyclopedia)personality, in psychology, the patterns of behavior, thought, and emotion unique to an individual, and the ways they interact to help or hinder the adjustment of a person to other people and situatio...

smallpox

(Encyclopedia)smallpox, acute, highly contagious disease causing a high fever and successive stages of severe skin eruptions. Occurring worldwide in epidemics, it killed up to 40% of those who contracted it and acc...

Merovingians

(Encyclopedia)Merovingians, dynasty of Frankish kings, descended, according to tradition, from Merovech, chief of the Salian Franks, whose son was Childeric I and whose grandson was Clovis I, the founder of the Fra...

arsenic

(Encyclopedia)arsenic ärˈsənĭk [key], a semimetallic chemical element; symbol As; at. no. 33; at. wt. 74.92160; m.p. 817℃ (at 28 atmospheres pressure); sublimation point 613℃; sp. gr. (stable form) 5.73; va...

Louis IX, king of France

(Encyclopedia)Louis IX or Saint Louis, 1214–70, king of France (1226–70), son and successor of Louis VIII. His mother, Blanche of Castile, was regent during his minority (1226–34), and her regency probably la...

Aral Sea

(Encyclopedia)Aral Sea ărˈəl [key], salt lake, SW Kazakhstan and NW Uzbekistan, E of the Caspian Sea in an area of interior drainage. To the north and west are the edges of the arid Ustyurt Plateau; the Kyzyl Ku...