HyperDicEnglishOPTIC ... optical crown

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Related WikiPedia: optical crown
English 1 sense of the expression optical crown:
NOUNsubstanceoptical crown, crown glass, optical crown glassoptical glass of low dispersion and low refractive index
Englishoptical crown: 1 sense noun 1, substance
Meaningoptical glass of low dispersion and low refractive index.
Synonymscrown glass, optical crown glass
Broaderoptical glassClear homogeneous glass of known refractive index

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