crown glass
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crown glass
n.
1. A soda-lime optical glass that is exceptionally hard and clear, with low refraction and low dispersion.
2. A form of window glass made by whirling a glass bubble to make a flat circular disk with a lump left in the center by the glass blower's rod.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
crown glass
n
1. (General Physics) another name for optical crown
2. (Building) an old form of window glass made by blowing a globe and spinning it until it formed a flat disc
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
crown′ glass`
n.
1. an optical glass of low dispersion and generally low index of refraction.
2. an old form of window glass formed by blowing a globe and whirling it into a disk.
[1700–10]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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| Noun | 1. | crown glass - a glass blown into a globe which is later flattened and spun to form a disk glass - a brittle transparent solid with irregular atomic structure |
| 2. | crown glass - optical glass of low dispersion and low refractive index optical glass - clear homogeneous glass of known refractive index; used to make lenses |
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