- A governmental establishment for the storing, development, manufacturing, testing, or repairing of arms, ammunition, and other war materiel.
- A stock of weapons.
- A store or supply: an arsenal of retorts.
[Italian arsenale, from obsolete arzanale, darsena, from Arabic aṣ ṣinā'a, manufacture, industry, and dār-aṣ-ṣinā'a, place of manufacture : dār, house (from dāra, to turn, revolve) + al-, the + ṣinā'a, manufacture (from ṣana'a, to make).]





