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debenture

(Encyclopedia)debenture dəbĕnˈchər [key], document acknowledging indebtedness. In Great Britain a debenture is practically the same as a bond, and debenture stock is similar to preferred stock. In the United St...

hydroxyl group

(Encyclopedia)hydroxyl group hīdrŏkˈsĭl [key], in chemistry, functional group that consists of an oxygen atom joined by a single bond to a hydrogen atom. An alcohol is formed when a hydroxyl group is joined by ...

Harvard College Observatory

(Encyclopedia)Harvard College Observatory, astronomical observatory located in Cambridge, Mass., operated by Harvard (Harvard College at the time of the observatory's founding in 1839). Its equipment includes a 61-...

formyl group

(Encyclopedia)formyl group fôrˈmĭl [key], in chemistry, functional group that consists of a carbonyl group joined by a single bond to a hydrogen atom. Aldehydes are compounds that contain a formyl group joined b...

resonance, in chemistry

(Encyclopedia)resonance, in chemistry: see chemical bond. ...

Diefenbaker, John George

(Encyclopedia)Diefenbaker, John George dēˈfənbāˌkər [key], 1895–1979, Canadian political leader. Elected to Parliament (1940), he succeeded George Drew as leader of the Progressive Conservative party (1956)...

Doane, George Washington

(Encyclopedia)Doane, George Washington, 1799–1859, Episcopal bishop of New Jersey (1832–59), b. Trenton, N.J. He acted as rector of St. Mary's Church, Burlington, N.J., and there he established a school for gir...

Downing, Sir George

(Encyclopedia)Downing, Sir George, 1623–84, English diplomat. A nephew of Gov. John Winthrop of Massachusetts, he was educated at Harvard. He returned (1646) to England, joined the parliamentarians, and was appoi...

Drew, George Alexander

(Encyclopedia)Drew, George Alexander, 1894–1973, Canadian political leader. A lawyer, he led the Conservative party in Ontario from 1938 and served in the provincial legislature (1939–48) and in the House of Co...

Dallas, George Mifflin

(Encyclopedia)Dallas, George Mifflin, 1792–1864, American statesman, vice president of the United States (1845–49), b. Philadelphia; son of Alexander James Dallas. He read law, was admitted (1813) to the bar, a...