Cellblock (noun)

A group of cells or rooms used for confinement, as in a prison or jail.

Origin:

Cell + block.

Examples:

1. The cellblock was overcrowded with inmates.
2. He was sent to the maximum security cellblock.
3. The cellblock was quiet during the night.
4. The smell in the cellblock was terrible.
5. The prisoners in the cellblock were allowed one hour of exercise per day.