penitentiary
1. [ adjective ] (law) used for punishment or reform of criminals or wrongdoers
Examples:

"penitentiary institutions"

Related terms: punitive
2. [ noun ] (law) a correctional institution for those convicted of major crimes
Synonyms: pen
Related terms: correctional_institution
Similar spelling:   penitentially
  penitential
  penitently
  penitence