Crossword Genius

Aqua fortis is ____ acid (6)

Ross

I believe the answer is:

nitric

(Other definitions for nitric that I've seen before include "Citrin (anag.)" , "Common type of acid" , "Very corrosive acid type" , "Colourless highly corrosive acid" , "kind of acid" .)

I've seen this clue in The Times and The Sunday Times.
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