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| an extraordinary or unusual thing, person, or event; an exceptional example or instance. |
| a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question. |
| water clock or water glass | |
| —n | |
| any of various devices for measuring time that use the escape of water as the motive force | |
| water glass or water glass | |
| —n | |
| water glass | |
| —n | |
| 1. | a viscous syrupy solution of sodium silicate in water: used as a protective coating for cement and a preservative, esp for eggs |
| 2. | water clock another name for water gauge |
water glass n.
See soluble glass.
water glass
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.
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