crown glass
Noun
Meaning
optical glass of low dispersion and low refractive index
a glass blown into a globe which is later flattened and spun to form a disk
Source: WordNetAlternative names
crown-glass
Noun
optical glass of low dispersion and low refractive index
a glass blown into a globe which is later flattened and spun to form a disk
Source: WordNetcrown-glass