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autogiro

(Encyclopedia)autogiro jīˈrəplān [key], type of aircraft supported in the air by a horizontally mounted airfoil similar to that of a helicopter but unpowered. Invented by the Spaniard Juan de la Cierva, it was ...

parachute

(Encyclopedia)parachute, umbrellalike device designed to retard the descent of a falling body by creating drag as it passes through the air. The development of modern aircraft has led to many experiments in the aer...

heliport

(Encyclopedia)heliport, airport designed exclusively for helicopter traffic. ...

Anchorage

(Encyclopedia)Anchorage ăngˈkərĭj [key], city (2020 pop. 291,247), Anchorage census div., S central Alaska, a port at the head of Cook Inlet; inc. 1920. It is the largest city in th...

Kinshasa

(Encyclopedia)Kinshasa kēnˈshäsə [key], city (1984 pop. 2,664,309), capital of the Democratic Republic of the Congo, W Congo, a port on Pool Malebo of the Congo River. It is the Congo's largest city and its adm...

police

(Encyclopedia)police, public and private agents concerned with the enforcement of law, order, and public protection. In modern cities their duties cover a wide range of activities, from criminal investigation and a...

Libyan Desert

(Encyclopedia)Libyan Desert, northeast part of the Sahara Desert, NE Africa, in SW Egypt, E Libya, and NW Sudan; called the Western Desert in Egypt. It is a region of sand dunes, stony plains, and rocky plateaus. T...

Environmental Protection Agency

(Encyclopedia)Environmental Protection Agency (EPA), independent agency of the U.S. government, with headquarters in Washington, D.C. It was established in 1970 to reduce and control air and water pollution, noise ...

Maiduguri

(Encyclopedia)Maiduguri mīdo͞oˈgərē [key], town (1991 est. pop. 282,000), capital of Borno state, NE Nigeria. The city is an important industrial center engaged in food processing and aluminum, steel, asbestos...

tunnel

(Encyclopedia)tunnel, underground passage usually made without removing the overlying rock or soil. Although tunnels are approximately horizontal, they must be built with sufficient gradient for proper drainage. Tu...