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burning glass

American  

noun

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


burning glass British  

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

Etymology

Origin of burning glass

First recorded in 1560–70

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.

See Examples For:

He and I know to move around them by sheer memory; the burning glass promises to singe the skin if touched.

From The Guardian Apr. 17, 2018

Many historians, in fact, have dismissed the story of the burning glass as a myth.

From Time Magazine Archive

The film begins with a helicoptic view, swooping over the dome of St. Peter's, then briefly darts away to Greece to catch the sun's rays igniting the traditional torch through a burning glass at Olympia.

From Time Magazine Archive

Secondly, was his 'into battle' period, when his superb rhetoric and unflinching courage focused like a burning glass the latent will to win of heroic, freedom-loving men the world over, when all seemed lost.

From Time Magazine Archive

He was like a great burning glass, concentrating the rays of the sun upon a single spot; he burned a hole wherever he went.

From How to Succeed or, Stepping-Stones to Fame and Fortune by Marden, Orison Swett

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