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watch-glass

noun
  1. a curved glass disc that covers the dial of a watch
  2. a similarly shaped piece of glass used in laboratories for evaporating small samples of a solution, etc
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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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