Oubliette definitions

o͝o'blē-ĕt'
A dungeon with a trapdoor in the ceiling as its only means of entrance or exit.
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A concealed dungeon having a trap door in the ceiling as its only opening.
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A dungeon only accessible by a trapdoor at the top. [from 18th c.]
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Origin of oubliette

French from oublier to forget from Old French oblider from Vulgar Latin oblītāre from Latin oblītus past participle of oblīvīscī lei- in Indo-European roots