crown glass
Americannoun
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an optical glass of low dispersion and generally low index of refraction.
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an old form of window glass formed by blowing a globe and whirling it into a disk.
noun
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another name for optical crown
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an old form of window glass made by blowing a globe and spinning it until it formed a flat disc
Etymology
Origin of crown glass
First recorded in 1700–10
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.
"We've looked everywhere and can't find anyone that can cast crown glass," he said.
From BBC ● Oct. 23, 2017
What is the ratio of thicknesses of crown glass and water that would contain the same number of wavelengths of light?
From Textbooks ● Aug. 12, 2015
Show that if the fiber is made from crown glass, any incident ray will be totally internally reflected.
From Textbooks ● Aug. 12, 2015
Answer the above question if the fluid between the two pieces of crown glass is carbon disulfide.
From Textbooks ● Aug. 12, 2015
For this reason crown glass made with a little alkali or kelp is preferred.
From Young's Demonstrative Translation of Scientific Secrets by Young, Daniel
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
