/ Thesaurus / N Synonyms of nitrohydrochloric acid Find synonyms for: Noun1. aqua regia, nitrohydrochloric acid, acidusage: a yellow fuming corrosive mixture of nitric and hydrochloric acid that dissolves metals (including gold)WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: anecdote Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language