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aging

(Encyclopedia) aging, in biology, cumulative changes in an organism, organ, tissue, or cell leading to a decrease in functional capacity. In humans, aging is associated with degenerative changes in…

adrenal gland

(Encyclopedia) CE5 Adrenal glands: The cross-sectioned area shows the adrenal cortex and medulla. adrenal glandadrenal glandədrēnˈəl [key] or suprarenal glandsuprarenal glands&oomacr;…

Santiago, city, Chile

(Encyclopedia) SantiagoSantiagosäntēäˈgō [key], city (1990 est. pop. 4,395,000), central Chile, capital of Chile and of Metropolitana de Santiago region, on the Mapocho River. It is the political,…

Greene, Graham

(Encyclopedia) Greene, Graham (Henry Graham Greene), 1904–91, English novelist and playwright. Although most of his works combine elements of the detective story, the spy thriller, and the…

murder

(Encyclopedia) murder, criminal homicide, usually distinguished from manslaughter by the element of malice aforethought. The most direct case of malicious intent occurs when the killer is known to…

Chopin, Frédéric François

(Encyclopedia) Chopin, Frédéric FrançoisChopin, Frédéric Françoisfrādārēkˈ fräNswäˈ shôpăNˈ [key], 1810–49, composer for the piano, b. near Warsaw, of French and Polish parentage. His lyrical, often…

amniocentesis

(Encyclopedia) amniocentesisamniocentesisămˌnēōˌsĕntēˈsĭs [key], diagnostic procedure in which a sample of the amniotic fluid surrounding a fetus is removed from the uterus by means of a fine needle…

bullfighting

(Encyclopedia) bullfighting, national sport and spectacle of Spain. Called the corrida de toros in Spanish, the bullfight takes place in a large outdoor arena known as the plaza de toros. The object…

Villon, François

(Encyclopedia) Villon, FrançoisVillon, FrançoisfräNswäˈ vēyôNˈ [key], 1431–1463?, French poet, b. Paris, whose original name was François de Montcorbier or François Des Loges. One of the earliest…

Chordata

(Encyclopedia) CE5 Common features in representative groups of the phylum Chordata ChordataChordatakôrdāˈtə, –däˈ– [key], phylum of animals having a notochord, or dorsal stiffening rod, as the…