jail

Jail is defined as "A place for the confinement of persons in lawful detention, especially persons awaiting trial under local jurisdiction."

It comes from two Middle English words jaiole coming from Old French, and gaiol, gaol from Old North French gaiole. Both of these words come from the Vulgar Latin *gaviola, from Latin *caveola, diminutive of cavea, "cage, hollow."

--From the American Heritage College Dictionary Fourth Edition