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pregnancy

(Encyclopedia)pregnancy, period of time between fertilization of the ovum (conception) and birth, during which mammals carry their developing young in the uterus (see embryo). The average duration of pregnancy in h...

AIDS, in medicine

(Encyclopedia)AIDS or acquired immunodeficiency syndrome, fatal disease caused by a rapidly mutating retrovirus that attacks the immune system and leaves the victim vulnerable to infections, malignancies, and neuro...

Henry II, king of England

(Encyclopedia)Henry II, 1133–89, king of England (1154–89), son of Matilda, queen of England, and Geoffrey IV, count of Anjou. He was the founder of the Angevin, or Plantagenet, line in England and one of the a...

Nicholas II, czar of Russia

(Encyclopedia)Nicholas II, 1868–1918, last czar of Russia (1894–1917), son of Alexander III and Maria Feodorovna. Discontent at home grew, the army tired of war, the food situation deteriorated, the governme...

Wittelsbach

(Encyclopedia)Wittelsbach vĭˈtəlsbäkh [key], German dynasty that ruled Bavaria from 1180 until 1918. The family takes its name from the ancestral castle of Wittelsbach in Upper Bavaria. In 1180 Holy Roman Emper...

airship

(Encyclopedia)airship, an aircraft that consists of a cigar-shaped gas bag, or envelope, filled with a lighter-than-air gas to provide lift, a propulsion system, a steering mechanism, and a gondola accommodating pa...

Labour party

(Encyclopedia)Labour party, British political party, one of the two dominant parties in Great Britain since World War I. Harold Wilson, who became leader on Gaitskell's death in 1963, was able to lead the party t...

knight

(Encyclopedia)knight, in ancient and medieval history, a noble who did military service as a mounted warrior. As the feudal system disintegrated, knight service was with growing frequency commuted into cash pay...

Ghent

(Encyclopedia)Ghent gĕnt [key], Du. Gent, Fr. Gand, city, capital of East Flanders prov., W Belgium, at th...

numeral

(Encyclopedia)numeral, symbol denoting anumber. The symbol is a member of a family of marks, such as letters, figures, or words, which alone or in a group represent the members of a numeration system. The earliest ...