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Crown glass

noun

Noun

1
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. uncountable, usually
2
optical glass of low dispersion and low refractive index wordnet
3
A variety of glass used in lenses and other optical components due to its low refractive index and dispersion. Originally crown glass was made from alkali-lime silicates with approximately 10% potassium oxide, but similar properties may be attained with other recipes. uncountable, usually
"The convex half of an achromatic lens is composed of crown glass."
4
a glass blown into a globe which is later flattened and spun to form a disk wordnet

So called from a crown-like shape given to it in the process of blowing.

Unscramble this word: crownglass