Columbia Encyclopedia

Search results

500 results found

pyroclastic flow

(Encyclopedia)pyroclastic flow, turbulent, fluidized mixture of rock, volcanic ash, and hot gas that moves like an avalanche away from a volcanic eruption. A pyroclastic flow may contain a mix of rock fragments ran...

Q fever

(Encyclopedia)Q fever, disease caused by Coxiella burnetii, a small, Gram-negative bacterium. The bacterium infects livestock (cattle, goats, and sheep) and other domesticated animals, and is found in the urine, fe...

injection

(Encyclopedia)injection, introduction of a fluid into the body, usually by means of a needle and syringe. The material injected may be a test substance (as in determining allergic sensitivity or immunity to a disea...

alloy

(Encyclopedia)alloy ălˈoi, əloiˈ [key] [O. Fr.,=combine], substance with metallic properties that consists of a metal fused with one or more metals or nonmetals. Alloys may be a homogeneous solid solution, a he...

guilt

(Encyclopedia)guilt, in psychology, a term denoting an unpleasant feeling associated with unfulfilled wishes. Sigmund Freud initially contended that sexual drives produce sense of guilt in the superego, the moral c...

physical therapy

(Encyclopedia)physical therapy or physiotherapy, treatment of disorders of the muscles, bones, or joints by means of physical agents—heat, light, water, manual and electronic massage, and exercise. Stroke, arthri...

Wilhelmina

(Encyclopedia)Wilhelmina vĭlˌhĕlmēˈnä [key], 1880–1962, queen of the Netherlands (1890–1948), daughter and successor of William III. Her mother, Emma of Waldeck-Pyrmont, was regent until 1898. Wilhelmina ...

blockade

(Encyclopedia)blockade, use of naval forces to cut off maritime communication and supply. Blockades may be used to prevent shipping from reaching enemy ports, or they may serve purposes of coercion. The term is rar...

military law

(Encyclopedia)military law, system of rules established for the government of persons in the armed forces. In most countries the legislature establishes the code of military law. It is distinguished from both marti...

cricket, sport

(Encyclopedia)cricket, ball-and-bat game played chiefly in Great Britain and the Commonwealth countries. In the early 21st cent., Twenty20, a new version of cricket with a much faster, more compressed format, eme...