Definition of arsenal

nocturnal Definition: (adjective) of the night; active at night. Petersons.com

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< arse

arsenate >

ar·se·nal    (ärs-nl) KEY  

NOUN:

1. A governmental establishment for the storing, development, manufacturing, testing, or repairing of arms, ammunition, and other war materiel.
2. A stock of weapons.
3. A store or supply: an arsenal of retorts.

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ETYMOLOGY:
Italian arsenale, from obsolete arzanale, darsena, from Arabic a in'a, manufacture, industry, and dr-a-in'a, place of manufacture : dr, house (from dra, to turn, revolve; see dwr in Semitic roots) + al-, the + in'a, manufacture (from ana'a, to make; see n in Semitic roots)

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