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Whittier, John Greenleaf

(Encyclopedia)Whittier, John Greenleaf hwĭtˈēər [key], 1807–92, American Quaker poet and reformer, b. near Haverhill, Mass. Whittier was a pioneer in regional literature as well as a crusader for many humanit...

tetraethyl lead

(Encyclopedia)tetraethyl lead tĕtˌrəĕthˈəl [key], (C2H5)4Pb, viscous, colorless, poisonous liquid. It is an organometallic compound prepared by reacting ethyl chloride with a sodium-lead alloy. When added to ...

hydrogen sulfide

(Encyclopedia)hydrogen sulfide, chemical compound, H2S, a colorless, extremely poisonous gas that has a very disagreeable odor, much like that of rotten eggs. It is slightly soluble in water and is soluble in carbo...

hydrotherapy

(Encyclopedia)hydrotherapy, use of water in the treatment of illness or injury. Although the medicinal and hygienic value of water was recognized by the early Greeks, hydrotherapy attained its widest use in the 18t...

Wolff, Christian von

(Encyclopedia)Wolff or Wolf, Christian von krĭsˈtyän fən vôlf [key], 1679–1754, German philosopher. One of the first to use the German language instead of Latin, he systematized and popularized the doctrines...

Bruce, Edward

(Encyclopedia)Bruce, Edward, d. 1318, Scottish king of Ireland, brother of Robert I of Scotland. He aided his brother in the war for independence from England and in 1315 was declared heir to Robert's throne. With ...

Reade, Charles

(Encyclopedia)Reade, Charles, 1814–84, English novelist and dramatist. He is noted for his historical romance The Cloister and the Hearth. After being elected a fellow of Magdalen College, Oxford, he was called t...

tarweed

(Encyclopedia)tarweed, any of several related resinous herbs (chiefly species of Hemizonia and Madia) of the family Asteraceae (aster family), having strongly scented and sticky herbage. Most North American species...

gasohol

(Encyclopedia)gasohol, a gasoline extender made from a mixture of gasoline (90%) and ethanol (10%; often obtained by fermenting agricultural crops or crop wastes) or gasoline (97%) and methanol, or wood alcohol (3%...

Stephenson, George

(Encyclopedia)Stephenson, George, 1781–1848, British engineer, noted as a locomotive builder. He learned to read and write in night school at the age of 18, while working in a colliery. He constructed (1814) a tr...