Etymology
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arsenal (n.)

c. 1500, "dockyard, dock with naval stores," from Italian arzenale, from Arabic dar as-sina'ah "workshop," literally "house of manufacture," from dar "house" + sina'ah "art, craft, skill," from sana'a "he made."

Applied by the Venetians to a large wharf in their city, which was the earliest reference of the English word. Sense of "public place for making or storing weapons and ammunition" is from 1570s. The London football club (1886) was named for the Royal Arsenal, Woolwich, where the original players worked.

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Definitions of arsenal

arsenal (n.)
all the weapons and equipment that a country has;
Synonyms: armory / armoury
arsenal (n.)
a military structure where arms and ammunition and other military equipment are stored and training is given in the use of arms;
Synonyms: armory / armoury
arsenal (n.)
a place where arms are manufactured;
Synonyms: armory / armoury
From wordnet.princeton.edu