a place to be forgotten in....ou·bli·ette (bl-t)
n.
A dungeon with a trapdoor in the ceiling as its only means of entrance or exit.
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[French, from oublier, to forget, from Old French oblider, from Vulgar Latin *obltre, from Latin obltus, past participle of oblvsc; see lei- in Indo-European roots.]
The American Heritage® Dictionary of the English Language, Fourth Edition copyright ©2000 by Houghton Mifflin Company. Updated in 2003. Published by Houghton Mifflin Company. All rights reserved.
oubliette [oo-blee-ett]
Noun
History a dungeon, the only entrance to which is a trap door in the ceiling [French oublier to forget]
Collins Essential English Dictionary 2nd Edition 2006 © HarperCollins Publishers 2004, 2006
mark stuck-in-oubliette-again Bailey