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pearl, gem

(Encyclopedia)pearl, hard, rounded secretion formed inside the shell of certain mollusks, used as a gem. It is secreted by the epithelial cells of the mantle, a curtain of tissue between the shell and body mass, an...

poison gas

(Encyclopedia)poison gas, any of various gases sometimes used in warfare or riot control because of their poisonous or corrosive nature. These gases may be roughly grouped according to the portal of entry into the ...

Powell, Colin Luther

(Encyclopedia)Powell, Colin Luther, 1937–2021, U.S. army general and government official, b. New York City, grad., City College (B.S., 1958); George Washington Univ...

Red Sea

(Encyclopedia)Red Sea, ancient Sinus Arabicus or Erythraean Sea, narrow sea, c.170,000 sq mi (440,300 sq km), c.1,450 mi (2,330 km) long and up to 225 mi ...

Port Augusta

(Encyclopedia)Port Augusta, city (2016 pop. 13,808), South Australia, S Australia, at the head of Spencer Gulf. It is a railroad center and a center for solar and other renewable energy. ...

Indo-Iranian

(Encyclopedia)Indo-Iranian, subfamily of the Indo-European family of languages, spoken by more than a billion people, chiefly in Afghanistan, Bangladesh, India, Iran, Nepal, Pakistan, and Sri Lanka (see The Indo-Eu...

mosque

(Encyclopedia)mosque mŏsk [key], building for worship used by members of the Islamic faith. Muhammad's house in Medina (a.d. 622), with its surrounding courtyard and hall with columns, became the prototype for the...

Florida, Straits of

(Encyclopedia)Florida, Straits of, passage, c.90 mi (145 km) wide, between the Florida Keys in the north and Cuba in the south. It connects the Gulf of Mexico with the Atlantic Ocean. ...

Whyalla

(Encyclopedia)Whyalla, city (1991 pop. 21,828), South Australia state, S Australia, on Spencer Gulf. The city has shipbuilding and iron and steel industries. Iron ore and iron and steel products are exported. ...

Lucania

(Encyclopedia)Lucania lo͞okāˈnēə [key], ancient region of S Italy. It was bounded on the east by the Gulf of Tarentum (now Taranto) and by Apulia, on the north by Samnium and Campania, on the west by the Tyrrh...