crown glass


noun

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.

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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. 2020

Example sentences from the Web for crown glass

British Dictionary definitions for crown glass

crown glass

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
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