Oubliette

[oo-blee-et] /ˌu bliˈɛt/

noun
1.
a secret dungeon with an opening only in the ceiling, as in certain old castles.
/ˌuːblɪˈɛt/
noun
1.
a dungeon, the only entrance to which is through the top
n.

“secret dungeon reached only via trapdoor,” 1819, from French oubliette (14c.), from Middle French oublier “to forget, show negligence,” Old French oblier, oblider, from Vulgar Latin *oblitare, from Latin oblitus, past participle of oblivisci “to forget” (see oblivion).

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