(usually, uncountable) An amorphous solid, often transparent substance, usually made by melting silica sand with various additives (for most purposes, a mixture of soda, potash and lime is added).
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The tabletop is made of glass.
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A popular myth is that window glass is actually an extremely viscous liquid.
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The ability of a segment of a glass sphere to magnify whatever is placed before it was known around the year 1000, when the spherical segment was called a reading stone, essentially what today we might term a frameless magnifying glass or plain glass paperweight.
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2013 September-October, Henry Petroski, “The Evolution of Eyeglasses”, in American Scientist: