Optics.
an optical glass of high dispersion and a relatively high index of refraction, composed of alkalis, lead oxide, and silica, with or without other bases, sometimes used as the diverging lens component of an achromatic lens.
[ 1665-75 ]
Optics.
an optical glass of high dispersion and a relatively high index of refraction, composed of alkalis, lead oxide, and silica, with or without other bases, sometimes used as the diverging lens component of an achromatic lens.
[ 1665-75 ]
Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012