aqua regis

== English == === Etymology === Learned borrowing from Latin aqua rēgis. === Noun === aqua regis (uncountable) Alternative form of aqua regia. == Latin == === Noun === aqua rēgis f (genitive aquae rēgis); first declension aqua regis; synonym of aqua rēgia ==== Declension ==== First-declension noun with a third-declension adjective.