Definition of air brick
: a hollowed or perforated brick or a metal box of brick size with grated sides used for ventilation the use of air bricks to help prevent the buildup of damp Last Friday January 14, the group of students were touring the Village and Monarch redevelopment site when they expressed their concerns over the loss of ornamental air bricks among the terraced houses on Lower Rockview Street. — Belfast Telegraph, 20 Jan. 2011
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First Known Use of air brick
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