Brig
WordNet
noun
(1) A penal institution (especially on board a ship)
(2) Two-masted sailing vessel square-rigged on both masts
WiktionaryText
Etymology 1
Abbreviated from brigantine, from brigantino; jail sense from the use of such ships as prisons
Noun
- A two-masted vessel, square-rigged on both foremast and main mast
- A jail or guardhouse, especially in a military installation