ˈstəl noun
( -s )
Etymology: perhaps modification of German stollen post, support, from Old High German stollo — more at stollen
1. : a round timber used to support the sides or back of a mine
2.
a. : one of a series of props wedged between the walls of a stope to hold up a platform for supporting miners, ore, or waste or to protect miners from falling stones
b. : a platform held up by stulls