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boulder, in geology

(Encyclopedia)boulder, large rock fragment formed by detachment from its parent consolidated rock by weathering and erosion. In engineering and geology, especially in the United States, the term is applied to loose...

Merryman, ex parte

(Encyclopedia)Merryman, ex parte, case decided in 1861 by Chief Justice Roger B. Taney sitting as a federal circuit judge in Baltimore. John Merryman, a citizen of Maryland, was imprisoned by the U.S. army on suspi...

Blondel, Maurice

(Encyclopedia)Blondel, Maurice, 1861–1949, French Catholic philosopher, b. Dijon. He was a professor at the universities of Montauban, Lille, and Aix-Marseille during his influential career. Like his contemporary...

chemotherapy

(Encyclopedia)chemotherapy kēˌmōthĕrˈəpē [key], treatment of disease with chemicals or drugs. One chemotherapeutic approach is the development of selectively toxic substances, i.e., substances that can destr...

laxative

(Encyclopedia)laxative, drug or other substance used to stimulate the action of the intestines in eliminating waste from the body. The term laxative usually refers to a mild-acting substance; substances of increasi...

sulfa drug

(Encyclopedia)sulfa drug, any of a class of synthetic chemical substances derived from sulfanilamide, or para-aminobenzenesulfonamide. Sulfa drugs are used to treat bacterial infections, although they have largely ...

Ross, Barney David

(Encyclopedia)Ross, Barney David, 1909–67, American boxer, b. New York City as Dov-Ber Rasofsky; he was also known as Beryl David Rasofsky and Barnet David Rasofsky. After an amateur career, Ross turned professio...

chorus, in Greek drama

(Encyclopedia)chorus, in the drama of ancient Greece. Originally the chorus seems to have arisen from the singing of the dithyramb, and the dithyrambic chorus allegedly became a true dramatic chorus when Thespis in...

pharmacology

(Encyclopedia)pharmacology, study of the changes produced in living animals by chemical substances, especially the actions of drugs, substances used to treat disease. Systematic investigation of the effects of drug...

tense

(Encyclopedia)tense [O.Fr., from Lat.,=time], in the grammar of many languages, a category of time distinctions expressed by any conjugated form of a verb. In Latin inflection the tense of a verb is indicated by a ...