Dictionaryaq'ua re'gi•aPronunciation: (rē'jē-u), [key] Chem. a yellow, fuming liquid composed of one part nitric acid and three to four parts hydrochloric acid: used chiefly to dissolve metals as gold, platinum, or the like. Also called nitrohydrochloric acid. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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