GNU Collaborative International Dictionary of English

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1.       
   Flint glass . (Chem.) A soft, heavy, brilliant glass, consisting essentially of a silicate of lead and potassium. It is used for tableware, and for optical instruments, as prisms, its density giving a high degree of dispersive power; -- so called, because formerly the silica was obtained from pulverized flints. Called also crystal glass.  Cf. Glass.
   1913 Webster
   ☞ The concave or diverging half on an achromatic lens is usually made of flint glass.
   1913 Webster