two-masted sailing vessel square-rigged on both masts
"The captain ordered the crew to lower the mainsail on the brig before it hit the storm surge."
a penal institution (especially on board a ship)
"The captain dragged the mutineers down to the brig where they would be locked up until we reached port."
A two-masted vessel, square-rigged on both foremast and mainmast
"The brigadier ordered his troops to advance before dawn."
Bridge.
Brigadier.