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room and pillar

 - 1 dictionary result

room-and-pil⋅lar

[room-uhn-pil-er, room-]
–adjective Mining.
noting a means of extracting coal or other minerals from underground deposits by first cutting out rooms, then robbing the pillars between them; pillar-and-breast.
Compare longwall.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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