double glazing

noun Building Trades.
glazing consisting of two thicknesses of glass with a dead air space between them.
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World English Dictionary
double glazing
 
n
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
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00:10
Double_glazing is always a great word to know.
So is zedonk. Does it mean:
the offspring of a zebra and a donkey.
a gadget; dingus; thingumbob.
Example sentences
If you don't have it already, consider installing double glazing to minimize
  heat loss from your house.
Advances in window technology such as double glazing and low-e coatings
  substantially reduce heat loss and gains.
Even with double glazing, homes with large windows can heat up in hot summer
  months.
Fabricate vision panels to receive double glazing where shown.
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