Meanings
nouncrown glass (usually uncountable, plural crown glasses)
plural crown glasses
- uncountableusuallyAn 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.
- uncountableusuallyengineeringA 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.
The convex half of an achromatic lens is composed of crown glass.
Synonyms & antonyms
nounoptical glass of low dispersion and low refractive index
Similar
optical crownoptical crown glass
Broader
Synonym sets from Open English WordNet, CC BY 4.0.
Origin
So called from a crown-like shape given to it in the process of blowing.
Full word history & related roots →Translations
Finnish kruunulasi, pullonpohjalasi
- kruunulasitype of window glass
- pullonpohjalasitype of window glass
- kruunulasivariety of optical glass
Cite this entry
APA
crown glass. (n.d.). In WatkinsX Dictionary. Retrieved November 2, 2026, from https://dictionary.watkinsx.com/word/crown%20glass
MLA
“crown glass.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/crown%20glass. Accessed November 2, 2026.
Chicago
WatkinsX Dictionary, s.v. “crown glass,” accessed November 2, 2026, https://dictionary.watkinsx.com/word/crown%20glass.
Source: crown glass on Wiktionary, CC BY-SA 4.0.