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burning glass

noun
1.
a converging lens used to produce heat or ignite substances by focusing the sun's rays.
Also called sunglass.
Origin
1560-1570
1560-70
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for burning glass

burning glass

noun
1.
a convex lens for concentrating the sun's rays into a small area to produce heat or fire
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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10
15
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