gaol
n.a prison. This is a word you mostly see in British English or in old stories.
n.a prison or place of detention. Primarily used in British English and often carries a literary or historical tone.
“The prisoner was sent to gaol for three years.”
“The old stone gaol stood on the edge of the town, a reminder of the city's history of crime.”
“The novel opens with the protagonist's arrival at the local gaol, where the cold stone walls and distant cries of the other inmates set the tone for the story's bleak atmosphere.”
From Middle English gayole, gaiol, gaylle, gaille, gayle, gaile, via Old French gaiole, gayolle, gaole, from Medieval Latin gabiola, for Late Latin caveola, a diminutive of Latin cavea (“cavity, coop, cage”). See also cage.
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.