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hardness

(Encyclopedia)hardness, property of matter commonly described as the resistance of a substance to being scratched by another substance. The degree of hardness is relative, different substances being compared with o...

Newport, Christopher

(Encyclopedia)Newport, Christopher, 1565?–1617, English mariner, commander of early voyages to Virginia. He commanded a privateering expedition to the West Indies (1592) that returned to England with the Spanish ...

Roebling, John Augustus

(Encyclopedia)Roebling, John Augustus rōˈblĭng [key], 1806–69, German-American engineer, b. Mulhouse. He studied engineering in Berlin and in 1831 came to the United States. He demonstrated the practicability ...

Acts of the Apostles

(Encyclopedia)Acts of the Apostles, book of the New Testament. It is the only 1st-century account of the expansion of Christianity in its earliest period. It was written in Greek anonymously as early as c.a.d. 65, ...

defoliant

(Encyclopedia)defoliant, any one of several chemical compounds that, when applied to plants, can alter their metabolism, causing the leaves to drop off. In agriculture defoliants are used to eliminate the leaves of...

Ontario, Lake

(Encyclopedia)Ontario, Lake, 7,540 sq mi (19,529 sq km), 193 mi (311 km) long and 53 mi (85 km) at its greatest width, between SE Ont., Canada, and NW N.Y.; smallest and lowest of the Great Lakes. It has a surface ...

Lowell

(Encyclopedia)Lowell, city (1990 pop. 103,439), a seat of Middlesex co., NE Mass., at the confluence of the Merrimack and Concord rivers; settled 1653, set off from Chelmsford 1826, inc. as a city 1836. High-techno...

Kisangani

(Encyclopedia)Kisangani kēsangäˈnē [key], formerly Stanleyville, city (1996 est. pop. 500,000), capital of Tshopo prov., N central Congo (Kinshasa), a port on the Congo River. The city is the terminus of steame...

adolescence

(Encyclopedia)adolescence, time of life from onset of puberty to full adulthood. The exact period of adolescence, which varies from person to person, falls approximately between the ages 12 and 20 and encompasses b...

Blatch, Harriet Stanton

(Encyclopedia)Blatch, Harriet Stanton (Harriet Eaton Stanton Blatch), 1856–1940, American labor reformer and woman suffrage leader, b. Seneca Falls, N.Y. A daughter of suffragist Elizabeth Cady Stanton and abolit...