oubliette

n.
A dungeon with a trapdoor in the ceiling as its only means of entrance or exit.

[French, from oublier, to forget, from Old French oblider, from Vulgar Latin *oblītāre, from Latin oblītus, past participle of oblīvīscī.]

A secret dungeon in the deepest parts of a medieval stronghold, having as its only entry a trapdoor through which prisoners were dropped.

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a dungeon with an opening only at the top

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The noun has one meaning:

Meaning #1: a dungeon with the only entrance or exit being a trap door in the ceiling

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