Meaning of aqua regia

aq'ua re'gi•a

Pronunciation: (rē'jē-u), [key]
— Chem. Chem.
  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. Also called
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.