Phrase guide
Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.
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noun
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.
Definition source: English Wiktionary via Wiktextract
Usage: uncountable, usually
No example sentence was provided for this meaning.
Synonyms: none provided
Antonyms: none provided
noun
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.
Definition source: English Wiktionary via Wiktextract
Usage: uncountable, usually
Topics: engineering, natural-sciences, optics, physical-sciences, physics
Synonyms: none provided
Antonyms: none provided
noun
optical glass of low dispersion and low refractive index
Definition source: Princeton WordNet 3.0
No example sentence was provided for this meaning.
Synonyms: optical crown, optical crown glass
Antonyms: none provided
Broader terms: optical glass
noun
a glass blown into a globe which is later flattened and spun to form a disk
Definition source: Princeton WordNet 3.0
No example sentence was provided for this meaning.
Synonyms: none provided
Antonyms: none provided
Broader terms: glass
History
So called from a crown-like shape given to it in the process of blowing.
Across languages
3 source translations are retained for this English entry.
