/ ˈɑːsənl; NAmE ˈɑːrs-/ noun
1.
a collection of weapons such as guns and explosives :
Britain's nuclear arsenal
2.
a building where military weapons and explosives are made or stored
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WORD ORIGIN
early 16th cent. (denoting a dock for the construction and repair of ships): from French , or from obsolete Italian arzanale , based on Arabic dār-aṣ-ṣinā'a , from dār house + al- (of) the + sinā'a art, industry.