Tartarus

[ tahr-ter-uh s ]
/ ˈtɑr tər əs /

noun Classical Mythology.

a sunless abyss, below Hades, in which Zeus imprisoned the Titans.
a place in Hades for the punishment of the wicked.
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British Dictionary definitions for tartarus

Tartarus

/ (ˈtɑːtərəs) /

noun Greek myth

an abyss under Hades where the Titans were imprisoned
a part of Hades reserved for evildoers
the underworld; Hades
a primordial god who became the father of the monster Typhon

Word Origin for Tartarus

C16: from Latin, from Greek Tartaros, of obscure origin
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012