room-and-pillar

/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.

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Universalium. 2010.

Look at other dictionaries:

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  • room-and-pillar — | ̷ ̷ ̷ ̷| ̷ ̷ ̷ ̷ adjective : bord and pillar * * * /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;… …   Useful english dictionary

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