Shaft (noun)

1. A long, thin, cylindrical object or part, especially one that is used as a support or to transmit power or motion.
2. A vertical passage or tunnel in a mine.

Origin:

Old english sceaft "pole, stem", of germanic origin; related to dutch schacht.

Examples:

1. The windmill's shaft turned the gears that powered the mill.
2. The shaft of the arrow was made from a lightweight material.
3. The miners descended the shaft to reach the coal seam.
4. The shaft of the umbrella was broken.
5. The shaft of the pen was made of brass.