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reducing glass

American

noun

a lens or mirror that produces a virtual image of an object smaller than the object itself.

reducing glass British

noun

a lens or curved mirror that produces an image smaller than the object observed

"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

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

While painting his designs, he looked through a reducing glass to see how his work would look when shrunk to about a sixth its actual size.

From New York Times • Feb. 1, 2016

Figure it out yourself—look at it through a reducing glass.

From From Xylographs to Lead Molds; A.D. 1440-A.D. 1921 by Forster, H. C.

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023