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Hay-Herrán Treaty
(Encyclopedia)Hay-Herrán Treaty hā-ĕränˈ [key], 1903, aborted agreement between the United States and Colombia providing for U.S. control of the prospective Panama Canal and for U.S. acquisition of a canal zon...furfural
(Encyclopedia) CE5 furfural fûrˌfərălˈdəhīd [key] [Lat.,=bran], C4H3OCHO, viscous, colorless liquid that has a pleasant aromatic odor; upon exposure to air it turns dark brown or black. It boils at about 1...Macy, Anne Sullivan
(Encyclopedia)Macy, Anne Sullivan, 1866–1936, American educator, friend and teacher of Helen Keller, b. Feeding Hills, Mass. Placed in Tewksbury almshouse (1876), she was later admitted (1880) to Perkins Institut...Basket Makers
(Encyclopedia)Basket Makers, name given to the members of an early Native North American culture in the Southwest, predecessors of the Pueblo. Because of the cultural continuity from the Basket Makers to the Pueblo...radio frequency
(Encyclopedia)radio frequency, range of electromagnetic waves with a frequency or wavelength suitable for communication uses. Some of these waves serve as carriers of the lower-frequency audio waves; others are mod...Lucretius
(Encyclopedia)Lucretius (Titus Lucretius Carus) lo͞okrēˈshəs [key], c.99 b.c.–c.55 b.c., Roman poet and philosopher. Little is known about his life. A chronicle of St. Jerome speaks of the loss of his reason ...methanol
(Encyclopedia)methanol, methyl alcohol, or wood alcohol, CH3OH, a colorless, flammable liquid that is miscible with water in all proportions. Methanol is a monohydric alcohol. It melts at −97.8℃ and boils at 6...tartaric acid
(Encyclopedia)tartaric acid, HO2CCHOHCHOHCO2H, white crystalline dicarboxylic acid. It occurs as three distinct isomers, the dextro-, levo-, and meso- forms. The dextro- and levo- forms are optically active; the me...Jackson, Andrew
(Encyclopedia)Jackson, Andrew, 1767–1845, 7th President of the United States (1829–37), b. Waxhaw settlement on the border of South Carolina and North Carolina (both states claim him). The greatest popula...DDT
(Encyclopedia)DDT or 2,2-bis(p-chlorophenyl)-1,1,1,-trichloroethane, chlorinated hydrocarbon compound used as an insecticide. First introduced during the 1940s, it killed insects that spread disease and fed on crop...Browse by Subject
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