Columbia Encyclopedia

Search results

285 results found

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...

seaweed

(Encyclopedia)seaweed, name commonly used for the multicellular marine algae. Simpler forms, consisting of one cell (e.g., the diatom) or of a few cells, are not generally called seaweeds; these tiny plants help to...

South African War

(Encyclopedia)South African War or Boer War, 1899–1902, war of the South African Republic (Transvaal) and the Orange Free State against Great Britain. The Boers accepted British sovereignty in exchange for a ...

exploration

(Encyclopedia)exploration, travel to a part of the earth that is relatively unknown to the traveler's culture, historically often motivated by a desire for colonization, conquest, or trade. See also space explorati...

Plato

(Encyclopedia)Plato plāˈtō [key], 427?–347 b.c., Greek philosopher. Plato's teachings have been among the most influential in the history of Western civilization. Many of the late dialogues are devoted to te...

Russian Far East

(Encyclopedia)Russian Far East, formerly Soviet Far East, federal district (1989 est. pop. 7,941,000), c.2,400,000 sq mi (6,216,000 sq km), encompassing the entire northeast coast of Asia and including the Sakha Re...

diamond

(Encyclopedia)diamond, mineral, one of two crystalline forms of the element carbon (see allotropy), the hardest natural substance known, used as a gem and in industry. The discoveries of 1870–71 in South Africa...

Cromwell, Oliver

(Encyclopedia)Cromwell, Oliver krŏmˈwĕl, krŭmˈ–, –wəl [key], 1599–1658, lord protector of England. Opinions of Cromwell have always varied widely. His military skill and force of character are univers...

abortion

(Encyclopedia)abortion, expulsion of the products of conception before the embryo or fetus is viable. Any interruption of human pregnancy prior to the 28th week is known as abortion. The term spontaneous abortion, ...

Gandhi, Mohandas Karamchand

(Encyclopedia)Gandhi, Mohandas Karamchand gänˈdē [key], 1869–1948, Indian political and spiritual leader, b. Porbandar. In 1942, after rejection of his offer to cooperate with Great Britain in World War II ...