Definition of footrill in US English:

footrill

noun

Coal Mining
  • An open cast mine consisting of near horizontal passages dug into the surface; a mine consisting of one or more near horizontal shafts or passages; such a shaft forming the entrance to a mine.

Origin

Late 17th century; earliest use found in Robert Plot (bap. 1640, d. 1696), naturalist and antiquary. Origin uncertain.

Pronunciation

footrill

/ˈfʊtr(ɪ)l/