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Noun
crown glass
Definition: a glass blown into a globe which is later flattened and spun to form a disk
optical crown
crown glass
optical crown glass
Definition: optical glass of low dispersion and low refractive index
Definition: An early type of window glass made by blowing glass into a hollow globe (crown) and then flattening it on a punty, reheating and spinning out into a flat disk by centrifugal force.