from The Century Dictionary and Cyclopedia
- n. Any compartment on a war-ship in which ammunition is stored for use: usually made water-tight and provided with means for flooding with water in case of fire on board. The term includes magazines, shell-rooms, and fixed-ammunition rooms.
Sorry, no etymologies found.
They then forced open the ammunition-room, secured weapons and cartridges, posted themselves behind the windows of their barracks, and fired at every Japanese they saw.