OUBLIETTES
Noun
oubliettes
plural of oubliette
Source: Wiktionary
OUBLIETTE
Ou`bli`ette", n. Etym: [F., fr. oublier to forget, fr. (assumed) LL.
oblitare, L. oblivisci, p. p. oblitus.]
Definition: A dungeon with an opening only at the top, found in some old
castles and other strongholds, into which persons condemned to
perpetual imprisonment, or to perish secretly, were thrust, or lured
to fall.
Sudden in the sun An oubliette winks. Where is he Gone. Mrs.
Browning.
Source: Webster’s Unabridged Dictionary 1913 Edition