名詞 water glass:

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