penal institution

Any place of confinement for convicted criminals. See 230 N.E. 2d 536, 541. Penal institutions include local and county jails and workhouses, reformatories, penitentiaries, prison camps and farms, as well as the modern correctional institution (new nomenclature used to describe many penal institutions previously called "prisons"). See jail.

The noun has one meaning:

Meaning #1: an institution where persons are confined for punishment and to protect the public
  Synonym: penal facility