stulm means A shaft, conduit, adit, or gallery to drain a mine. Lexicurio rates it Sui generis — a strength score of 87 out of 100.
Etymology
From German Stollen (“tunnel”).
noun
- A shaft, conduit, adit, or gallery to drain a mine.“… they have to advance the lower stulm on each side of the tunnel … the advancement of the stulm, … it must be finished, including the graveling.”