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Watch glass   /wɑtʃ glæs/   Listen
Watch glass

noun
1.
Laboratory glassware; a shallow glass dish used as an evaporating surface or to cover a beaker.
2.
A protective cover that protects the face of a watch.  Synonyms: crystal, watch crystal.





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"Watch glass" Quotes from Famous Books



... Shake up a little flour with ether in a test tube, with a tight-fitting cork. Allow the mixture to stand for an hour, shaking it from time to time. Filter off the ether, and place some of it on a perfectly clean watch glass. Allow the ether to evaporate, when a greasy stain will be left, thus showing the presence of fats ...
— A Practical Physiology • Albert F. Blaisdell


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