burning glass

burning glass

noun
a converging lens used to produce heat or ignite substances by focusing the sun's rays.
Also called sunglass.


Origin:
1560–70

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
burning glass
 
n
a convex lens for concentrating the sun's rays into a small area to produce heat or fire

Collins English Dictionary - Complete & Unabridged 10th Edition
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