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helicopter

(Encyclopedia)helicopter, type of aircraft in which lift is obtained by means of one or more power-driven horizontal propellers called rotors. When the rotor of a helicopter turns it produces reaction torque which ...

Puyehue–Cordón Caulle

(Encyclopedia)Puyehue–Cordón Caulle, volcanic complex, SE Chile, in the Andes Mts. within Puyehue National Park. The volcanic chain comprises (NW to SE) the Cordillera Nevada caldera (5,902 ft/1,799 m high), the...

Centers for Disease Control and Prevention

(Encyclopedia)Centers for Disease Control and Prevention (CDC), agency of the U.S. Public Health Service since 1973, with headquarters in Atlanta; it was established in 1946 as the Communicable Disease Center. The ...

Del Rio

(Encyclopedia)Del Rio rēˈō [key], city (2020 pop. 34,673), seat of Val Verde co., W Tex., on the Rio Gra...

San Angelo

(Encyclopedia)San Angelo săn ănˈjəlō [key], city (1990 pop. 84,474), seat of Tom Green co., W Tex., where two forks join to form the Concho River; laid out 1869, inc. 1903. It is an important wool and mohair m...

Auburn

(Encyclopedia)Auburn ôˈbərn [key]. 1 City (2020 pop. 76,143), Lee co., E Ala.; inc. 1839. The city's economy centers around Auburn Univ.; there is some manufacturing. 2 City (2...

chinook, warm, dry air mass

(Encyclopedia)chinook, warm, dry air mass that descends the eastern slopes of the U.S. and Canadian Rocky Mts. after having lost moisture by condensation over the western slopes. Chinooks occur mainly in winter. Th...

United States Air Force Academy

(Encyclopedia)United States Air Force Academy, at Colorado Springs, Colo.; for training young men and women to be officers in the U.S. air force; authorized in 1954 by Congress. Temporary quarters were opened at th...

Wright-Patterson Air Force Base

(Encyclopedia)Wright-Patterson Air Force Base, U.S. military installation, 8,023 acres (3,247 hectares), W Ohio, NE of Dayton; est. 1917. One of the largest airport installations in the world, it is the air force's...

prostitution

(Encyclopedia)prostitution, act of granting sexual access for payment. Although most commonly conducted by females for males, it may be performed by females or males for either females or males. Prostitution in A...