double-glazed
US /ˌdʌb.əlˈɡleɪzd/
UK /ˌdʌb.əlˈɡleɪzd/
1.
having two layers of glass with a space between them, typically to reduce heat loss and deaden sound
:
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The new windows are double-glazed, which helps keep the house warm in winter.
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We need to replace our old, single-glazed windows with double-glazed ones for better insulation.