room-and-pillar

room-and-pillar
\\| ̷ ̷ ̷ ̷| ̷ ̷ ̷ ̷\ adjective

* * *

/roohm"euhn pil"euhr, room"-/, adj. 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. Cf. longwall.

Useful english dictionary. 2012.

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