Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio.
a hard, bright glass containing lead oxide and having a high index of refraction, used for lenses, crystal, etc.
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 soft, fusible, lustrous, brilliant lead-oxide optical glass with high refraction and low dispersion. Also called lead glass.