Water-glass meaning

A drinking glass or goblet.
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An open tube or box having a glass bottom for making observations below the surface of the water.
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A water gauge made of glass.
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A glass-bottomed tube or box for looking at things under water.
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Sodium silicate or, sometimes, potassium silicate, occurring as a powder, usually dissolved in water to form a colorless, syrupy liquid used as an adhesive, as a protective or waterproofing coat, as a preservative for eggs, etc.
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(inorganic chemistry) A common name for some water-soluble silicate compounds, especially when occurring in dissolved, jelly-like form.
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