WordReference Random House Unabridged Dictionary of American English © 2017
reducing glass′, 
  • Opticsa lens or mirror that produces a virtual image of an object smaller than the object itself.

  • Collins Concise English Dictionary © HarperCollins Publishers::

    reducing glass n
    1. a lens or curved mirror that produces an image smaller than the object observed


    Word of the day: joke | drape


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