crown glass
Americannoun
-
an optical glass of low dispersion and generally low index of refraction.
-
an old form of window glass formed by blowing a globe and whirling it into a disk.
noun
-
another name for optical crown
-
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
Show that if the fiber is made from crown glass, any incident ray will be totally internally reflected.
From Textbooks ● Aug. 12, 2015
An optical fiber uses flint glass clad with crown glass.
From Textbooks ● Aug. 12, 2015
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
The old staple trade of the making of crown glass, begun in 1777, lapsed some 70 years afterwards when the glass duty was abolished.
From Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 8 "Dubner" to "Dyeing" by Various
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.
