Armory
From Memory Alpha, the free Star Trek reference.
The armory, or armoury or weapons room, of a starship or other facility was a secured location where weapons and other offensive or defensive devices are stored under security measures, to prevent unauthorized personnel from gaining access.
A starship often had several armories located in various areas of the ship. On some vessels, armories also hold photon torpedoes and other ship-based weapons. They were typically manned by an armory officer.
Deep Space 9 possessed an armory, which Odo was to have his Bajoran Militia officers report to after he managed to persuade Weyoun to allow them to carry weapons. (DS9: "A Time to Stand")
Vor'cha-class starships also possess armories. After being taken over by the Saltah'na energy spheres, Captain Tel-Peh of the IKS Toh'Kaht seized the armory, which Hon-Tihl's forces were not able to take control of. (DS9: "Dramatis Personae")
