water glass

Noun
  1. A viscous glass consisting of sodium silicate in solution;
    Used as a cement or as a protective coating and to preserve eggs (synset 114906729)
  2. A glass for drinking water (synset 104567196)
  3. Gauge for indicating the level of water in e.g. a tank or boiler or reservoir (synset 104567016)
  4. Clock that measures time by the escape of water (synset 104565633)

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