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acne
Any of some 50 inflammatory diseases of the oil glands of the skin. Acne vulgaris, probably the most frequent chronic skin disorder, results from an interplay of hereditary factors, hormones, and bacteria, beginning in the teen years when overactive sebaceous glands are stimulated by high levels of androgens. Its primary lesion, the blackhead, may be open or closed; it consists of a plug of skin oil (sebum), cell debris, and microorganisms in a hair follicle. Acne has four grades of severity, with increasing degrees of spread, inflammation, pustule formation, and scarring. Lower grades generally respond to treatment, which may include skin medication, sunlight, antibiotics, and hormones; many cases eventually resolve spontaneously.
Cuna
Chibchan-speaking Indian people who once occupied the central region of what is now Panama and the neighboring San Blas Islands and who still survive in marginal areas. In the 16th cent. they lived in federated villages under chiefs who wielded considerable power. They had a hierarchical society and enslaved prisoners of war. Today they live in small villages and depend on agriculture, supplemented by hunting and fishing, for subsistence.
Cuno
German politician and business leader. After serving in government positions from 1907, in 1918 he became general director of the Hamburg-Amer. Line, the largest German shipping concern. He served as chancellor of the Weimar Republic 1922-23, enjoying the strong support of German business and industry but failing to readjust war reparations or halt inflation. During the Ruhr Occupation he urged a national policy of passive resistance, which ultimately overtaxed the economy. Obliged to resign, he returned to Hamburg-American and again served as chairman 1926-33.
Acoma
Indian pueblo, W central New Mexico. It is located on a reservation west of Albuquerque and is known as the "Sky City." Its people live in terraced dwellings made of stone and adobe atop a sandstone butte 357 ft (109 m) high. Settled in the 10th cent., it is believed to be the oldest continuously inhabited place in the U.S. In 1540 Spanish explorer F. Coronado described it as the strongest defensive position in the world.
acorn
Nut of the oak. Acorns are usually seated in or surrounded by a woody cupule. They mature within one to two seasons, and their appearance varies depending on the species of oak. Acorns provide food for small game animals and are used to fatten swine and poultry.
Acre
Seaport city (pop., 1993 est.: 44,000), NW Israel on the Mediterranean coast. First mentioned in an Egyptian text from the 19th cent. BC, it was ruled by Egyptians, Romans, Persians, and Arabs; under Phoenician rule it was called Ptolemais. It was a Syrian town under the Seljuq Turks when the crusaders captured it in 1104; the Crusaders renamed the city St. Jean d'Acre and made it their last capital (see ...
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