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Related to chimney breast: Chimney stack
1. (Building) the wall or walls that surround the base of a chimney or fireplace
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|Noun||1.||chimney breast - walls that project out from the wall of a room and surround the chimney base|
wall - an architectural partition with a height and length greater than its thickness; used to divide or enclose an area or to support another structure; "the south wall had a small window"; "the walls were covered with pictures"