water glass

(noun) a viscous glass consisting of sodium silicate in solution; used as a cement or as a protective coating and to preserve eggs. Synonyms: soluble glass, water glass, sodium silicate.

(noun) a glass for drinking water. Synonyms: water glass.

(noun) gauge for indicating the level of water in e.g. a tank or boiler or reservoir. Synonyms: water gauge, water gage, water glass.

(noun) clock that measures time by the escape of water. Synonyms: water clock, clepsydra, water glass.