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.
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Webster, Noah. Entry for 'Flint Glass'. Noah Webster's American Dictionary. https://www.studylight.org/dictionaries/eng/web/f/flint-glass.html. 1828.