Crossword Genius

__ regia: gold-dissolving substance (4)

Ross

I believe the answer is:

aqua

(Other definitions for aqua that I've seen before include "Tint of blue" , "Latin for water" , "(Denoting) water (Lat)" , "- Regia; - fortis" , "Water (L)" .)

I've seen this clue in the LA Times.
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