from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A corrosive, fuming, volatile mixture of hydrochloric and nitric acids, used for testing metals and dissolving platinum and gold. Also called nitrohydrochloric acid.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A mixture of three parts concentrated hydrochloric acid to one part concentrated nitric acid.
from the GNU version of the Collaborative International Dictionary of English
- n. a very corrosive fuming yellow liquid consisting of nitric and hydrochloric acids. It has the power of dissolving gold, the “royal” metal.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a yellow fuming corrosive mixture of nitric and hydrochloric acid that dissolves metals (including gold)
New Latin aqua rēgia : Latin aqua, water + Latin rēgia, feminine of rēgius, royal (because it dissolves gold, the "royal metal”).(American Heritage® Dictionary of the English Language, Fourth Edition)
Latin aqua regia, royal water, so named because it is one of the few solvents capable of dissolving noble metals. (Wiktionary)