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rubella

(Encyclopedia)rubella or German measles, acute infectious disease of children and young adults. It is caused by a filterable virus that is spread by droplet spray from the respiratory tract of an infected individua...

Russian Revolution

(Encyclopedia)Russian Revolution, violent upheaval in Russia in 1917 that overthrew the czarist government. The civil war between the Bolsheviks (Reds) and the anti-Bolsheviks (Whites) ravaged Russia until 1920. ...

SARS

(Encyclopedia)SARS or severe acute respiratory syndrome, communicable viral disease that can progress to a potentially fatal pneumonia. The first symptoms of SARS are usually a high fever, headache and body aches, ...

Ramos, Fidel Valdez

(Encyclopedia)Ramos, Fidel Valdez fēdĕlˈ väldĕsˈ räˈmōs [key], 1928–, Philippine general and politician, president of the Philippines (1992–98), b. Lingayen. A career army officer, he became deputy chi...

refraction

(Encyclopedia)refraction, in physics, deflection of a wave on passing obliquely from one transparent medium into a second medium in which its speed is different, as the passage of a light ray from air into glass. O...

refugee

(Encyclopedia)refugee, one who leaves one's native land either because of expulsion or to escape persecution. The legal problem of accepting refugees is discussed under asylum; this article considers only mass disl...

Icelandic language

(Encyclopedia)Icelandic language, member of the North Germanic, or Scandinavian, group of the Germanic subfamily of the Indo-European family of languages. Spoken chiefly in Iceland, where it is the official languag...

impeachment

(Encyclopedia)impeachment, in Great Britain and United States, formal accusation issued by a legislature against a public official charged with crime or other serious misconduct. In a looser sense the term is somet...

tetanus

(Encyclopedia)tetanus tĕtˈnəs, –ənəs [key] or lockjaw, acute infectious disease of the central nervous system caused by the toxins of Clostridium tetani. The organism has a widespread distribution and is com...

tetany

(Encyclopedia)tetany tĕtˈənē [key], condition of mineral imbalance in the body that results in severe muscle spasms. Tetany occurs when the concentration of calcium ions (Ca++) in extracellular fluids such as p...