bearing wall

noun
any of the walls supporting a floor or the roof of a building.

Origin:
1870–75

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
Instead, wedged between the interior plaster wall and exterior clapboard is a
  non-load-bearing wall of bricks.
Generally a bearing wall runs at right angles to the joists above.
Pilasters and bond beams, although performing some of the functions of frame
  members, are priced with the exterior bearing wall.
If cover is not available, drop by interior weight bearing wall.
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