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double glazing▼◼◼◼(A system of insulated windows (and doors) having two parallel layers of glass separated by an air space)noun[UK: ˈdʌb.l̩ ˈɡleɪz.ɪŋ] [US: ˈdʌb.l̩ ˈɡleɪz.ɪŋ]
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