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geriatrics

(Encyclopedia)geriatrics jĕrēăˈtrĭks [key], the branch of medicine concerned with conditions and diseases of the aged. Many disabilities in old age are caused by or related to the deterioration of the circulat...

Bar Mitzvah

(Encyclopedia)Bar Mitzvah bärmĭtsˈvə [key] [Aramaic,=son of the Commandment], Jewish ceremony in which the young male is initiated into the religious community, according to tradition at the age of 13 years and...

Visby

(Encyclopedia)Visby wĭzˈbē [key], city (1990 pop. 20,990), capital of Gotland co., SE Sweden, on Gotland Island and on the Baltic Sea. It is an industrial center and a popular resort and has a modern ice-free po...

ozone layer

(Encyclopedia)ozone layer or ozonosphere, region of the stratosphere containing relatively high concentrations of ozone, located at altitudes of 12–30 mi (19–48 km) above the earth's surface. Ozone in the ozone...

Drexel, Anthony Joseph

(Encyclopedia)Drexel, Anthony Joseph drĕkˈsəl [key], 1826–93, American banker and philanthropist, b. Philadelphia. He entered (1838) at an early age the well-known banking firm of Drexel and Company, founded b...

Drude, Paul Karl Ludwig

(Encyclopedia)Drude, Paul Karl Ludwig poul kärl lo͝otˈvĭkh dro͞oˈdə [key], 1863–1906, German physicist. Drude first experimented with the physical determinants of optical constants, measuring the optical c...

muscular dystrophy

(Encyclopedia)muscular dystrophy dĭsˈtrōfē [key], any of several inherited diseases characterized by progressive wasting of the skeletal muscles. There are five main forms of the disease. They are classified ac...

Hobsbawm, Eric John Ernest

(Encyclopedia)Hobsbawm, Eric John Ernest , 1917–2012, British Marxist historian, b. Alexandria, Egypt. Educated at Cambridge (Ph.D., 1951), he joined the Communist party there in 1936. He served in the British ar...

Leidy, Joseph

(Encyclopedia)Leidy, Joseph līˈdē [key], 1823–91, American scientist, b. Philadelphia, grad. Univ. of Pennsylvania medical school. From 1853 he taught anatomy at his alma mater. He was also professor of natura...

Graham Land

(Encyclopedia)Graham Land, part of the Antarctic Peninsula, W Antarctica. This ice-covered, mountainous area was thought to be a group of islands but further exploration (1934) showed it to be peninsular. Claimed b...