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room and pillar

Noun CEFR C1

Definitions

A variant of breast stoping in which the mined material is extracted across a horizontal plane, creating horizontal arrays of rooms and pillars.

uncountable

CEFR level

C1
Advanced
This word is part of the CEFR C1 vocabulary — advanced level.
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See also

room by the hour room divider room for a pony room for doubt room for maneuver room meat

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