Tartarus n. : The infernal regions, described in the Iliad as situated as far below Hades as heaven is above the earth, and by later writers as the place of punishment for the spirits of the wicked. By the later poets, also, the name is often used synonymously with Hades, or the Lower World in general.

Example:
Spiritually Speaking: how can we stop the christians from going to Tartarus?

Taxonomy
Tartarus, Zeus, pit, punishment, Greek mythology, sinners, Earth, Hades, the Titans, deity, the gods of Olympus, Revelation, free encyclopedia, souls, Hell, cast, punishment fits the crime, dark pit.

Defination from the web:
Tartarus. ... While, according to Greek mythology, The Realm of Hades is the place of the dead, Tartarus also has a number of inhabitants. ...