[ lawng-wawl, long- ]
/ ˈlɔŋˌwɔl, ˈlɒŋ- /
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.
the continuous face so worked.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for longwall
A few days later Maurice had come along with news of rooms in Longwall.
The New College man he was going to live with is going down, and he had fixed up some rather jolly digs in Longwall.