room-and-pillar
[ room-uh n-pil-er, roo m- ]
/ ˈrum ənˈpɪl ər, ˈrʊm- /
adjective 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.
Compare
longwall.
Words nearby room-and-pillar
room divider,
room father,
room mother,
room service,
room temperature,
room-and-pillar,
roomer,
roomette,
roomful,
roomie,
rooming house