Etymology
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aqua fortis (n.)

also aquafortis, old commercial name for "diluted nitric acid," c. 1600, Latin, literally "strong water;" see aqua- + fort. So called for its power of dissolving metals (copper, silver) which are unaffected by other agents.

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Definitions of aqua fortis

aqua fortis (n.)
acid used especially in the production of fertilizers and explosives and rocket fuels;
Synonyms: nitric acid
From wordnet.princeton.edu