burning glass

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noun

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

Origin of burning glass

First recorded in 1560–70
Also called sunglass.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for burning glass

burning glass

noun

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