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crown glass

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noun
  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.
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Origin of crown glass

First recorded in 1700–10
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for crown glass

crown glass

noun
  1. another name for optical crown
  2. an old form of window glass made by blowing a globe and spinning it until it formed a flat disc
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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