room-and-pillar

[room-uhn-pil-er, room-]

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. 2012.
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Room-and-pillar is always a great word to know.
So is flibbertigibbet. Does it mean:
a fool or simpleton; ninny.
a chattering or flighty, light-headed person.
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