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ammonia
(Encyclopedia) ammonia, chemical compound, NH3, colorless gas that is about one half as dense as air at ordinary temperatures and pressures. It has a characteristic pungent, penetrating odor. Ammonia…plateresque
(Encyclopedia) plateresqueplateresqueplătərĕskˈ [key] [Span.,=silversmith], earliest phase of Spanish Renaissance architecture and decoration, in the early 16th cent. Its richness of effect was…hydrocephalus
(Encyclopedia) hydrocephalushydrocephalushīˌdrəsĕfˈələs [key], also known as water on the brain, developmental (congenital) or acquired condition in which there is an abnormal accumulation of body…Wölfflin, Heinrich
(Encyclopedia) Wölfflin, HeinrichWölfflin, Heinrichhīnˈrĭkh völfˈlĭn [key], 1864–1945, Swiss art historian. Wölfflin's formal stylistic analysis of motifs and composition in art combined cultural…halogen
(Encyclopedia) halogenhalogenhălˈəjĕn [key] [Gr.,=salt-bearing], any of the chemically active elements found in Group 17 of the periodic table; the name applies especially to fluorine (symbol F),…sediment
(Encyclopedia) sediment, mineral or organic particles that are deposited by the action of wind, water, or glacial ice. These sediments can eventually form sedimentary rocks (see rock). Sediments…corrosion
(Encyclopedia) corrosion, atmospheric oxidation of metals (see oxidation and reduction). By far the most important form of corrosion is the rusting of iron. Rusting is essentially a process of…concerto
(Encyclopedia) concertoconcertokənchârˈtō [key], musical composition usually for an orchestra and a soloist or a group of soloists. In the 16th cent. concertare and concertato implied an ensemble,…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…canon, in music
(Encyclopedia) canon, in music, a type of counterpoint employing the strictest form of imitation. All the voices of a canon have the same melody, beginning at different times. Successive entrances…Trending
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