■ noun a store of weapons and ammunition.
↘a military establishment where weapons and ammunition are made and stored.
Origin
C16 (in the sense 'a dockyard'): from Fr., or from obs. Ital. arzanale , based on Arab. dār-aṛ-ṛinā῾a , from dār 'house' + al- '(of) the' + sinā῾a 'art, industry'.