water glass

noun

1. 1. a drinking glass or goblet
   2. a glass container for water, etc.
2. water gauge (sense )
3. a glass-bottomed tube or box for looking at things under water
4. sodium silicate or, sometimes, potassium silicate, occurring as a stony 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.
5. water clock