water glass
noun
1
: a glass vessel (such as a drinking glass) for holding water
2
: an instrument consisting of an open box or tube with a glass bottom used for examining objects in or under water
3
: a substance that consists usually of the silicate of sodium, is found in commerce as a glassy mass, a stony powder, or dissolved in water as a viscous syrupy liquid, and is used especially as a cement, a protective coating, and as a fireproofing agent
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Merriam-Webster unabridged
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