a small room in which a prisoner is locked up or in which a monk or nun sleeps.
So what that means is that he's locked up at night in a prison cell on his own, so that's solitary confinement.
the smallest structural and functional unit of an organism, typically microscopic and consisting of cytoplasm and a nucleus enclosed in a membrane. Microscopic organisms typically consist of a single cell, which is either eukaryotic or prokaryotic.
When this occurs, the cytoplasm from the two cells fuses, but the nuclei remain separate and distinct.
a small group forming a nucleus of political activity, typically a secret, subversive one.
the weapons may be used to arm terrorist cells
the local area covered by one of the short-range transmitters in a cellular telephone system.
The service operates in local areas known as cells .
a device containing electrodes immersed in an electrolyte, used for current-generation or electrolysis.
This is said to be important when welding heat-sensitive parts such as miniature battery cells or sensitive electronic devices.