from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A soft, fusible, lustrous, brilliant lead-oxide optical glass with high refraction and low dispersion.
from The Century Dictionary.
- noun A variety of glass in which the silica is combined with oxid of lead in greater or less quantity.
from the GNU version of the Collaborative International Dictionary of English.
- (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.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun A soft, heavy, brilliant
glass, consisting essentially of a silicateof leadand potassium. It is used for tablewareand in optical instruments.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun optical glass of high dispersion and high refractive index
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