from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A soda-lime optical glass that is exceptionally hard and clear, with low refraction and low dispersion.
  • noun A form of window glass made by whirling a glass bubble to make a flat circular disk with a lump left in the center by the glass blower's rod.

from The Century Dictionary.

  • noun A good quality of common blown window-glass.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun a glass blown into a globe which is later flattened and spun to form a disk
  • noun optical glass of low dispersion and low refractive index


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