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water glass

noun
1.
a drinking glass; tumbler.
2.
a glass container for holding water, as for growing bulbs, plants, or the like.
3.
a glass tube used to indicate water level, as in a boiler.
4.
a device for observing objects beneath the surface of the water, consisting essentially of an open tube or box with a glass bottom.
Also, waterglass.
Origin
1600-1610
1600-10
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for water glass

water clock

noun
1.
any of various devices for measuring time that use the escape of water as the motive force

water glass

noun
1.
a viscous syrupy solution of sodium silicate in water: used as a protective coating for cement and a preservative, esp for eggs
2.
another name for water clock, water gauge
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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water glass in Medicine

water glass n.
See soluble glass.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Encyclopedia Article for water glass

sodium silicate

crystal-like lumps that range from colourless to white or grayish white and resemble glass but can be dissolved in water to form a syrupy liquid. Some forms are slightly soluble, and some are almost insoluble; they are best dissolved by heating with water under pressure. A little water dissolves water glass more readily than much water does. The solutions are strongly alkaline. The chemical formulas Na2SiO3, Na6Si2O7, and Na2Si3O7 describe the composition of various forms of water glass.

Learn more about sodium silicate with a free trial on Britannica.com
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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8
8
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