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Abano, Pietro d'

(Encyclopedia)Abano, Pietro d' pyāˈtrō däˈbänō [key], 1250?–1316?, Italian physician and philosopher, a professor of medicine in Padua. His famous work Conciliator differentiarum was an attempt to reconcil...

propane

(Encyclopedia)propane, CH3CH2CH3, colorless, gaseous alkane. It is readily liquefied by compression and cooling. It melts at −189.9℃ and boils at −42.2℃. Propane occurs in nature in natural gas and (in diss...

Fourier, Charles

(Encyclopedia)Fourier, Charles shärl fo͞oryāˈ [key], 1772–1837, French social philosopher. From a bourgeois family, he condemned existing institutions and evolved a kind of utopian socialism. In Théorie des ...

gas, fuel

(Encyclopedia)gas, fuel, gaseous substance that burns in air and releases enough heat to be useful as a fuel, while also remaining sufficiently stable at ordinary temperatures to permit long-term storage without de...

Mayr, Ernst

(Encyclopedia)Mayr, Ernst ĕrnst mīr [key], 1904–2005, American zoologist and author, b. Kempten, Germany. He began his career in Berlin and emigrated to the United States in 1931, where, until 1953, he was asso...

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...

lacquer

(Encyclopedia)lacquer, solution of film-forming materials, natural or synthetic, usually applied as an ornamental or protective coating. Quick-drying synthetic lacquers are used to coat automobiles, furniture, text...

transmutation of elements

(Encyclopedia)transmutation of elements, conversion of one chemical element into another. The expression has both historical and contemporary significance. The transmutation of certain metals into gold by means of ...

transposing instrument

(Encyclopedia)transposing instrument, a musical instrument whose part in a score is written at a different pitch than that actually sounded. Such an instrument is usually referred to by the keynote of its natural s...

bog

(Encyclopedia)bog, very old lake without inlet or outlet that becomes acid and is gradually overgrown with a characteristic vegetation (see swamp). Peat moss, or sphagnum, grows around the edge of the open water of...