optical flint

World English Dictionary
optical flint
 
n
Also called: flint glass an optical glass of high dispersion and high refractive index containing lead oxide. They are used in the manufacture of lenses, artificial gems, and cut glass

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WordNet
optical flint

noun
optical glass of high dispersion and high refractive index 
WordNet® 3.0, © 2006 by Princeton University.
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