تلفظ بین المللی : /ɹɪstɹˈeɪnə/ تلفظ : [rI2str'eIn3]
English
One who, or that which, restrains.
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. Note: The concave or diverging...
