__ regia: gold-dissolving substance (4)
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 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)" .)