[ahr-suh-nl, ahrs-nuhl]
a place of storage or a magazine containing arms and military equipment for land or naval service.
a government establishment where military equipment or munitions are manufactured.
a collection or supply of weapons or munitions.
a collection or supply of anything; store: He came to the meeting with an impressive arsenal of new research data.

1500–10; (< Middle French) < Italian arzanale < Upper Italian (Venetian) arzanà dockyard < Arabic dār ṣināʿah workshop (literally, house of handwork); initial d probably taken as a form of the preposition di from Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
arsenal (ˈɑːsənəl)
1.  a store for arms, ammunition, and other military items
2.  a workshop or factory that produces munitions
3.  a store of anything regarded as weapons: an arsenal of destructive arguments
[C16: from Italian arsenale dockyard, from the original Venetian arsenal dockyard and naval store, from Arabic dār sīn`ah, from dār house + sīn`ah manufacture]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

c.150o, "dockyard," from It. arzenale, from Arabic dar as-sina'ah "workshop," lit. "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 meaning in Eng. 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.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The developed world still has some powerful weapons in its arsenal.
Arsenal trawls the world for players with potential and fielded players from
All this because we've taken a traditional punishment such as flogging out of
  the arsenal.
Superbugs immune to almost everything in the antibiotic arsenal are the stuff
  of science fiction.
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