Water glass Meaning, Definition & Usage

1. noun a viscous glass consisting of sodium silicate in solution; used as a cement or as a protective coating and to preserve eggs
   soluble glass; sodium silicate.
   
2. noun a glass for drinking water
   
3. noun gauge for indicating the level of water in e.g. a tank or boiler or reservoir
   water gauge; water gage.
   
4. noun clock that measures time by the escape of water
   water clock; clepsydra.
   

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