Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio.
- window glass made in flat, circular plates by blowing and whirling, with a small knot in the center left by the blower's rod
- a very clear optical glass with a low index of refraction
Used by arrangement with John Wiley & Sons, Inc.
nounThe American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
- A soda-lime optical glass that is exceptionally hard and clear, with low refraction and low dispersion.
- 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.