This is the 17617th most frequent Russian word.
тюремной
"Тюремной" means "prison" or "pertaining to prison."
Adjective describing 'камера' (cell) to indicate it is related to prison.
Заключённый оставался в тюремной камере.
The prisoner remained in the prison cell.
Part of 'тюремной жизни' (prison life) where 'тюремной' is an adjective describing 'жизни' (life) to indicate it occurs under prison conditions.
Тюремной жизни он не хотел возвращаться.
He did not want to return to prison life.
Adjective describing 'системы' (systems) to specify they are related to prisons.