Cell

1. Any small compartment; "the cells of a honeycomb".
2. The basic structural and functional unit of all organisms; cells may exist as independent units of life (as in monads) or may form colonies or tissues as in higher plants and animals.
3. A device that delivers an electric current as the result of a chemical reaction.
4. A small unit serving as the nucleus of a larger political movement.
5. Small room is which a monk or nun lives.
6. A room where a prisoner is kept.

Shown is a prison cell.