Columbia Encyclopedia

Search results

500 results found

fluorescence

(Encyclopedia)fluorescence flo͝orĕsˈəns [key], luminescence in which light of a visible color is emitted from a substance under stimulation or excitation by light or other forms of electromagnetic radiation or ...

Chalcedon, Council of

(Encyclopedia)Chalcedon, Council of, fourth ecumenical council, convened in 451 by Pulcheria and Marcian, empress and emperor of the East, to settle the scandal of the Robber Synod and to discuss Eutychianism (see ...

Suffolk sheep

(Encyclopedia)Suffolk sheep, relatively large breed, developed in England, well-known for its high quality meat. Considered to be a recent introduction to the United States, the breed has many desirable qualities a...

propagation of plants

(Encyclopedia)propagation of plants is effected in nature chiefly sexually by the seed and the spore, less often by rhizomes and other methods (see reproduction). Vegetative means include cutting, layering, graftin...

combustion

(Encyclopedia)combustion, rapid chemical reaction of two or more substances with a characteristic liberation of heat and light; it is commonly called burning. The burning of a fuel (e.g., wood, coal, oil, or natura...

Winchilsea, Anne Finch, countess of

(Encyclopedia)Winchilsea, Anne Finch, countess of wĭnˈchəlsē [key], 1661–1720, English poet. In 1684 she married Heneage Finch, who became (1712) 4th earl of Winchilsea. Though her friendships extended to the...

meter, unit of measure

(Encyclopedia)meter, abbr. m, fundamental unit of length in the metric system. The meter was originally defined as 1/10,000,000 of the distance between the equator and either pole; however, the original survey was ...

Douglas, city, Isle of Man

(Encyclopedia)Douglas, city, capital of the Isle of Man, Great Britain. It is a popular resort, connected by rail to Ramsey and Port Erin, on the Irish Sea. Tourism i...

Stamford, city, United States

(Encyclopedia)Stamford, city (1990 pop. 108,056), Fairfield co., SW Conn., on Long Island Sound; settled 1641, inc. 1893 as a city within the town of Stamford (the two were consolidated in 1949). A variety of light...

Martin, Homer Dodge

(Encyclopedia)Martin, Homer Dodge, 1836–97, American landscape painter, b. Albany, N.Y. His earlier works are in the style of the Hudson River school, but after his stay in France (1881–86) his work showed the ...