A brick or tile with holes or vents in it, used in construction to allow air circulation under floors or in walls.
From 'air' plus 'brick' (from Middle Dutch 'bricke'), describing a brick designed specifically to allow airflow through building structures.
In British architecture, airbricks are like the building's lungs—without them, moisture would collect under old wooden floors and cause rot, so Victorian homes are full of these humble ventilation heroes!
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