Where does “oubliette” come from?

oubliette (English) comes from French oubliette, from French oublier, from Old French oblier, from Vulgar Latin *oblītāre, from Latin oblīvīscor.

oubliette (English): A dungeon only accessible by a trapdoor at the...

Definitions

Step	Language	Word	Meaning
1	French	oubliette	oubliette
2	French	oublier	to forget; to leave something behind by accident
3	Old French	oblier	to forget
4	Vulgar Latin	*oblītāre	—
5	Latin	oblīvīscor	—

oubliette — Etymology, Origin & Word History | Etymology Explorer