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longwall

[lawng-wawl, long-] /ˈlɔŋˌwɔl, ˈlɒŋ-/
adjective, Mining.
1.
noting or pertaining to a means of extracting coal or other minerals in an underground mine from a continuous face, the roof before the face being supported at intervals by temporary or movable artificial supports.
Compare room-and-pillar.
noun
2.
the continuous face so worked.
Origin
1830-1840
1830-40; long1 + wall
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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