Crossword clues for the word: REGIA The word REGIA has appeared as an answer to at least 11 crossword clues on different crossword puzzles. Crossword clues for REGIA Showing 1 to 11 of 11 results Clue(s) ___ via (king's highway): Lat. "Aqua ___, gold-dissolving liquid" Aqua __ (strong acid) Aqua ___ (etching fluid) Aqua ___ (nitric acid mixture) Aqua ___: corrosive acid Aqua ___: gold dissolver Aqua ___: platinum dissolver Aqua ---: mixture of nitric and hydrochloric acids that dissolves gold or platinum Palace in the Forum Romanum Palace: Lat.