aqua regalis

aqua regia; aqua regalis 1. Royal water: a fuming, highly corrosive mixture of nitric and hydrochloric acids. 2. Another term for nitrohydrochloric acid. Called 'royal water' because of its power to dissolve gold. Aqua regia is used for testing metals and dissolving platinum and gold.
Found on http://www.wordinfo.info/words/index/info/view_unit/170/2
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