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aqua regia

[ree-jee-uh]
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noun Chemistry.
  1. 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.
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Origin of aqua regia

1600–10; < New Latin: literally, royal water
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for aqua regia

aqua regia

noun
  1. a yellow fuming corrosive mixture of one part nitric acid and three to four parts hydrochloric acid, used in metallurgy for dissolving metals, including goldAlso called: nitrohydrochloric acid
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Word Origin

C17: from New Latin: royal water; referring to its use in dissolving gold, the royal metal
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

aqua regia in Science

aqua regia

[rējē-ə, rējə]
  1. A corrosive, fuming, volatile mixture of hydrochloric and nitric acids. Aqua regia is used for testing metals and dissolving platinum and gold.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.