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letters

(Encyclopedia)letters, in literature, written messages, ranging from those addressed to the public and those sent from lover to lover, to business letters and thank-you notes. The common quality they share is a liv...

Savannah, city, United States

(Encyclopedia)Savannah, city (1990 pop. 137,560), seat of Chatham co., SE Ga., a port of entry on the Savannah River near its mouth; inc. 1789. A rail, fishing, and industrial center, it is a leading southern port ...

Tay-Sachs disease

(Encyclopedia)Tay-Sachs disease tāˈ-săksˈ [key], rare hereditary disease caused by a genetic mutation that leaves the body unable to produce an enzyme necessary for fat metabolism in nerve cells, producing cent...

tropics

(Encyclopedia)tropics, also called tropical zone or torrid zone, all the land and water of the earth situated between the Tropic of Cancer at lat. 231⁄2°N and the Tropic of Capricorn at lat. 231⁄2°S. Every po...

Stuart, British royal family

(Encyclopedia)Stuart or Stewart, royal family that ruled Scotland and England. The Stuart lineage began in a family of hereditary stewards of Scotland, the earliest of whom was Walter (d. 1177), grandson of a Norma...

Darwin, Charles Robert

(Encyclopedia)Darwin, Charles Robert, 1809–82, English naturalist, b. Shrewsbury; grandson of Erasmus Darwin and of Josiah Wedgwood. He firmly established the theory of organic evolution known as Darwinism. He st...

KwaZulu-Natal

(Encyclopedia)KwaZulu-Natal kwäzo͞oˈlo͞o-nätälˈ [key], province (2011 pop. 10,267,300), 36,433 sq mi (94,361 sq km), E South Africa, on the Indian Ocean. Formerly Natal province, in the post-apartheid consti...

Mary I, 1516–58, queen of England

(Encyclopedia)Mary I (Mary Tudor), 1516–58, queen of England (1553–58), daughter of Henry VIII and Katharine of Aragón. During the spread of Protestantism in the reign of her half-brother, Edward VI, Mary w...

semantics

(Encyclopedia)semantics [Gr.,=significant] in general, the study of the relationship between words and meanings. The empirical study of word meanings and sentence meanings in existing languages is a branch of lingu...

atomic weight

(Encyclopedia)atomic weight, mean (weighted average) of the masses of all the naturally occurring isotopes of a chemical element, as contrasted with atomic mass, which is the mass of any individual isotope. Althoug...