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Covington
(Encyclopedia)Covington kŭvˈĭngtən [key], city (2020 pop. 40,181), seat of Kenton co., N central Ky., at the ...china clay
(Encyclopedia)china clay, one of the purest of the clays, composed chiefly of the mineral kaolinite usually formed when granite is changed by hydrothermal metamorphism. Usage of the terms china clay and kaolin is n...Des Moines, city, United States
(Encyclopedia)Des Moines dĭ moinˈ [key], city (2020 pop. 214,133), state capital and seat of Polk co., S ...Durham, city, United States
(Encyclopedia)Durham dûrˈăm [key], city (2020 pop. 324,833), seat of Durham co., N central N.C., in the ...fiber optics
(Encyclopedia)fiber optics, transmission of digitized messages or information by light pulses along hair-thin glass or plastic fibers. Each fiber is surrounded by a cladding having a high index of refractance so th...button
(Encyclopedia)button, knoblike appendage used on wearing apparel either for ornament or for fastening. Although buttons were sometimes used as fasteners by Greeks and Romans, they were more often merely ornamental ...centering
(Encyclopedia)centering, the framework of wood or of wood and steel built to support a masonry arch or vault during its construction. The centering itself must be rigidly supported, either by posts from the ground ...Castagno, Andrea del
(Encyclopedia)Castagno, Andrea del ändrĕˈä dĕl kästäˈnyō [key], c.1423–1457, major Florentine painter of the early Renaissance. His first recorded painting (1440; now destroyed), effigies of hanged men, ...casting
(Encyclopedia)casting or founding, shaping of metal by melting and pouring into a mold. Most castings, especially large ones, are made in sand molds. Sand, mixed with a binder to hold it together, is pressed around...cellulose
(Encyclopedia)cellulose, chief constituent of the cell walls of plants. Chemically, it is a carbohydrate that is a high molecular weight polysaccharide. Raw cotton is composed of 91% pure cellulose; other important...Browse by Subject
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