double glazing

noun Building Trades.
glazing consisting of two thicknesses of glass with a dead air space between them. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To double glazing
World English Dictionary
double glazing
1.  two panes of glass in a window, fitted to reduce the transmission of heat, sound, etc
2.  the fitting of glass in such a manner

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
Even with double glazing, homes with large windows can heat up in hot summer
Double glazing is a good choice for cold winters, since it entails less heat
  loss and less condensation.
The window on the left is a double glazing with low-E and an insulating spacer.
Advances in window technology such as double glazing and low-e coatings
  substantially reduce heat loss and gains.
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