water glass

Noun

• clock that measures time by the escape of water

• gauge for indicating the level of water in e.g. a tank or boiler or reservoir

• a glass for drinking water

• a viscous glass consisting of sodium silicate in solution; used as a cement or as a protective coating and to preserve eggs

Related words

• Synonyms: 
  water clock , clepsydra , water gauge , water gage , soluble glass , sodium silicate