The Collaborative International Dictionary
Nitrohydrochloric acid
Nitrohydrochloric \Ni`tro*hy`dro*chlo"ric\, a. [Nitro- + hydrochloric.] (Chem.) Of, pertaining to, or containing, nitric and hydrochloric acids.
Nitrohydrochloric acid, a mixture of nitric and hydrochloric acids, usually in the proportion of one part of the former to three of the latter, and remarkable for its solvent action on gold and platinum; -- called also aqua regia, and nitromuriatic acid.
WordNet
nitrohydrochloric acid
n. a yellow fuming corrosive mixture of nitric and hydrochloric acid that dissolves metals (including gold) [syn: aqua regia]