Drum

noun

1. A percussive musical instrument spanned with a thin covering on at least one end for striking, forming an acoustic chamber, affecting what materials are used to make it; a membranophone.
2. Any similar hollow, cylindrical object.

   "Replace the drum unit of your printer."

3. A barrel or large cylindrical container for liquid transport and storage.

   "The restaurant ordered ketchup in 50-gallon drums."

4. The encircling wall that supports a dome or cupola.
5. Any of the cylindrical blocks that make up the shaft of a pillar.