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1. (n.) crown glass
an optical glass of low dispersion and generally low index of refraction.
2. crown glass
an old form of window glass formed by blowing a globe and whirling it into a disk.
Etymology: (1700–10)
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| Definition of 'crown glass' |
Princeton's WordNet |
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1. (noun) crown glass
a glass blown into a globe which is later flattened and spun to form a disk
2. (noun) optical crown, crown glass, optical crown glass
optical glass of low dispersion and low refractive index
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