Merriam-Webster Collegiate Dictionary - arsphenamine

 noun  Etymology: International Scientific Vocabulary arsenic + phenamine  Date: 1917 a light-yellow toxic hygroscopic powder C12Cl2H14As2N2O2•2H2O formerly used in the treatment especially of syphilis and yaws ART DECO  noun  Usage: often capitalized A&D  Etymology: French Art Deco, from Exposition Internationale des Arts Decoratifs et Industriels Modernes, an exposition of modern decorative and industrial arts held in Paris, France, in 1925  Date: 1966 a popular design style of the 1920s and 1930s characterized especially by bold outlines, geometric and zigzag forms, and the use of new materials (as plastic)