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forestry

(Encyclopedia)forestry, the management of forest lands for wood, water, wildlife, forage, and recreation. Because the major economic importance of the forest lies in wood and wood products, forestry has been chiefl...

air forces

(Encyclopedia)air forces, those portions of a nation's military organization employing heavier-than-air aircraft for reconnaissance, support of ground troops, aerial combat, and bombing of enemy lines of communicat...

Tajikistan

(Encyclopedia)CE5 Tajikistan təjĭkĭstänˈ [key], officially Republic of Tajikistan, republic (2015 est. pop. 8,192,000), 55,251 sq mi (143,100 sq km), central Asia. It borders on China in the east, Afghanist...

menstruation

(Encyclopedia)menstruation, periodic flow of blood and cells from the lining of the uterus in humans and most other primates, occurring about every 28 days in women. Menstruation commences at puberty (usually betwe...

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...

diesel engine

(Encyclopedia)diesel engine, type of internal-combustion engine invented by the German engineer Rudolf Diesel and patented by him in 1892. Although his engine was designed to use coal dust as fuel, the diesel engin...

Great Awakening

(Encyclopedia)Great Awakening, series of religious revivals that swept over the American colonies about the middle of the 18th cent. It resulted in doctrinal changes and influenced social and political thought. In ...

Portland, cities, United States

(Encyclopedia)Portland. 1 City (1990 pop. 64,358), seat of Cumberland co., SW Maine, situated on a small peninsula and adjacent land, with a large, deepwater harbor on Casco Bay; settled c.1632, set off from Falmou...

Providence

(Encyclopedia)Providence, city (1990 pop. 160,728), state capital and seat of Providence co., NE R.I., a port at the head of Providence Bay; founded by Roger Williams 1636, inc. as a city 1832. The largest city in ...

public health

(Encyclopedia)public health, field of medicine and hygiene dealing with the prevention of disease and the promotion of health by government agencies. In the United States, public health authorities are engaged in m...