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silicic acid a gelatinous substance occurring when alkaline silicates are acidified.
silicon a chemical element that has fourteen protons in each nucleus, that is found naturally only in compounds such as silica, that composes one fourth of the earth's crust, and that is used in many industrial applications. (symbol: Si)
silicone any of a number of compounds containing silicon and oxygen that remain stable under a wide range of temperatures, are extremely water-repellent, and are used in adhesives, lubricants, varnishes and paints, and many other products.
silicone rubber a rubberlike polymer processed from silicone, which retains its resilience in a wide temperature range.
silicosis a disabling lung disease caused by prolonged inhalation of silica dust.
silk a fine, soft, shiny fiber produced by certain insects, esp. by the silkworm in spinning a cocoon. [5 definitions]
silk cotton a silky fiber covering the seeds of certain tropical trees such as the silk-cotton, used as a soft stuffing material.
silken made of or similar to silk in appearance or texture. [2 definitions]
silk hat a man's formal black top hat covered with a silken material.
Silk Road a name given to the ancient trade routes between China and southern Europe, through southern Asia.
silkscreen a method of printmaking employing a framed screen of silk or other fine fabric, on which a stencil design of impermeable film is impressed, and through which ink is pressed, through the pores not blocked by the design, onto a flat printing surface; serigraphy. [4 definitions]
silk-stocking elegantly or luxuriously dressed. [3 definitions]
silkworm the larva of an Asian moth that spins pure and commercially valued silk to form its cocoon, or any of various other moth larvae that spin cocoons of similar material.
silky of or like silk; smooth, delicate, or shimmering. [2 definitions]
sill a horizontal strip or block serving as the foundation for a window or door frame. [2 definitions]
sillabub variant of syllabub.
silly lacking good sense; foolish. [3 definitions]
silo a high, usu. cylindrical structure used to store fodder. [3 definitions]
silt fine sediment deposited by water, as of earth, clay, or sand. [3 definitions]
Silurian of, relating to, or designating the geological period between the Ordovician and Devonian of the Paleozoic Era, from approximately 440 million to 400 million years ago, when coral reefs began forming and land plants and air-breathing animals appeared. [2 definitions]
silva the trees or forests of a designated area. [2 definitions]