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Black Belt

(Encyclopedia)Black Belt, term applied to several areas of Mississippi and Alabama, the heart of the Old South, which are characterized by black soil and excellent cotton-growing conditions. The Black Belt area was...

Ptah

(Encyclopedia)Ptah ptä [key], in Egyptian religion, great god of Memphis. He was one of the important gods of ancient Egypt and, according to Memphite theology, created the universe through the thought of his hear...

Fort Peck Dam

(Encyclopedia)Fort Peck Dam, 21,430 ft (6,531 m) long and 250 ft (76 m) high, on the Missouri River, NE Mont.; one of the world's largest earth-filled dams. The dam was built (1933–40) by the U.S. Army Corps of E...

oasis

(Encyclopedia)oasis ōāˈsĭs [key], an area within a desert where the water table reaches the surface, with enough moisture to permit the growth of vegetation. The water may come up to the surface in springs, or ...

Whipple, Fred Lawrence

(Encyclopedia)Whipple, Fred Lawrence, 1906–2004, American astronomer, b. Red Oak, Iowa. After graduating from the Univ. of California, Berkeley (Ph.D. 1931), he accepted a position at Harvard, where he remained f...

bionics

(Encyclopedia)bionics, the study of living systems with the intention of applying their principles to the design of engineering systems. Drawing on interdisciplinary research in the mechanical and life sciences, bi...

Pointe-Noire

(Encyclopedia)Pointe-Noire pwăNt-nwär [key], city (1984 pop. 294,203), SW Republic of the Congo, Africa, a port on the Atlantic Ocean. Offshore oil drilling and oil refining are the city's most important economic...

pyroxylin

(Encyclopedia)pyroxylin pīrŏkˈsĭlĭn [key], partially nitrated cellulose (see nitrocellulose). It is used in lacquers, plastics, and artificial leathers. Pyroxylin lacquers are made by dissolving pyroxylin in a...

Port Charlotte

(Encyclopedia)Port Charlotte, uninc. town (1990 pop. 41,535), Charlotte co., SW Fla., on Charlotte Harbor (an inlet of the Gulf of Mexico) and the Peace and Myakka rivers. It is a planned residential community—on...

depressant

(Encyclopedia)depressant, any one of various substances that diminish functional activity, usually by depressing the nervous system. Barbiturates, sedatives, alcohol, and meprobamate are all depressants. Depressant...